diff --git a/Makefile b/Makefile
index 4f70cb45..0276ae1f 100644
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,7 @@ MOCHA = ./node_modules/mocha/bin/_mocha
 UGLIFY = ./node_modules/uglify-js/bin/uglifyjs
 
 ISTANBUL_OPTS = --dir $(COVERAGE_DIR) --report html
-JSHINT_OPTS = --reporter node_modules/jshint-stylish/stylish.js
+JSHINT_OPTS = --reporter node_modules/jshint-stylish/index.js
 MOCHA_OPTS = -R dot
 
 BUILD_DIR = build
diff --git a/lib/alg/topsort.js b/lib/alg/topsort.js
index 0964b173..531e4847 100644
--- a/lib/alg/topsort.js
+++ b/lib/alg/topsort.js
@@ -32,3 +32,4 @@ function topsort(g) {
 }
 
 function CycleException() {}
+CycleException.prototype = new Error(); // must be an instance of Error to pass testing
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 6bdafc2c..a345296c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,9 +1,26 @@
 {
   "name": "graphlib",
-  "version": "2.1.5",
+  "version": "2.1.6-pre",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@browserify/acorn5-object-spread": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/@browserify/acorn5-object-spread/-/acorn5-object-spread-5.0.1.tgz",
+      "integrity": "sha512-sFCUPzgeEjdq3rinwy4TFXtak2YZdhqpj6MdNusxkdTFr9TXAUEYK4YQSamR8Joqt/yii1drgl5hk8q/AtJDKA==",
+      "dev": true,
+      "requires": {
+        "acorn": "5.4.1"
+      },
+      "dependencies": {
+        "acorn": {
+          "version": "5.4.1",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.4.1.tgz",
+          "integrity": "sha512-XLmq3H/BVvW6/GbxKryGxWORz1ebilSsUDlyC27bXhWGWAZWkGwS6FLHjOlwFXNFoWFQEO/Df4u0YYd0K3BQgQ==",
+          "dev": true
+        }
+      }
+    },
     "JSONStream": {
       "version": "1.3.2",
       "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.2.tgz",
@@ -14,6 +31,12 @@
         "through": "2.3.8"
       }
     },
+    "JSV": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/JSV/-/JSV-4.0.2.tgz",
+      "integrity": "sha1-0Hf2glVx+CEy+d/67Vh7QCn+/1c=",
+      "dev": true
+    },
     "abbrev": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
@@ -36,12 +59,55 @@
       "integrity": "sha1-EFSVrlNh1pe9GVyCUZLhrX8lN4c=",
       "dev": true
     },
+    "acorn-node": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/acorn-node/-/acorn-node-1.3.0.tgz",
+      "integrity": "sha512-efP54n3d1aLfjL2UMdaXa6DsswwzJeI5rqhbFvXMrKiJ6eJFpf+7R0zN7t8IC+XKn2YOAFAv6xbBNgHUkoHWLw==",
+      "dev": true,
+      "requires": {
+        "acorn": "5.4.1",
+        "xtend": "4.0.1"
+      },
+      "dependencies": {
+        "acorn": {
+          "version": "5.4.1",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.4.1.tgz",
+          "integrity": "sha512-XLmq3H/BVvW6/GbxKryGxWORz1ebilSsUDlyC27bXhWGWAZWkGwS6FLHjOlwFXNFoWFQEO/Df4u0YYd0K3BQgQ==",
+          "dev": true
+        }
+      }
+    },
+    "addressparser": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/addressparser/-/addressparser-1.0.1.tgz",
+      "integrity": "sha1-R6++GiqSYhkdtoOOT9HTm0CCF0Y=",
+      "dev": true,
+      "optional": true
+    },
     "after": {
       "version": "0.8.2",
       "resolved": "https://registry.npmjs.org/after/-/after-0.8.2.tgz",
       "integrity": "sha1-/ts5T58OAqqXaOcCvaI7UF+ufh8=",
       "dev": true
     },
+    "agent-base": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-2.1.1.tgz",
+      "integrity": "sha1-1t4Q1a9hMtW9aSQn1G/FOFOQlMc=",
+      "dev": true,
+      "requires": {
+        "extend": "3.0.1",
+        "semver": "5.0.3"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "5.0.3",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.0.3.tgz",
+          "integrity": "sha1-d0Zt5YnNXTyV8TiqeLxWmjy10no=",
+          "dev": true
+        }
+      }
+    },
     "ajv": {
       "version": "5.5.2",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz",
@@ -71,10 +137,53 @@
       "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
       "dev": true
     },
+    "amqplib": {
+      "version": "0.5.2",
+      "resolved": "https://registry.npmjs.org/amqplib/-/amqplib-0.5.2.tgz",
+      "integrity": "sha512-l9mCs6LbydtHqRniRwYkKdqxVa6XMz3Vw1fh+2gJaaVgTM6Jk3o8RccAKWKtlhT1US5sWrFh+KKxsVUALURSIA==",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "bitsyntax": "0.0.4",
+        "bluebird": "3.5.1",
+        "buffer-more-ints": "0.0.2",
+        "readable-stream": "1.1.14",
+        "safe-buffer": "5.1.1"
+      },
+      "dependencies": {
+        "isarray": {
+          "version": "0.0.1",
+          "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
+          "integrity": "sha1-ihis/Kmo9Bd+Cav8YDiTmwXR7t8=",
+          "dev": true,
+          "optional": true
+        },
+        "readable-stream": {
+          "version": "1.1.14",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz",
+          "integrity": "sha1-fPTFTvZI44EwhMY23SB54WbAgdk=",
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "core-util-is": "1.0.2",
+            "inherits": "2.0.3",
+            "isarray": "0.0.1",
+            "string_decoder": "0.10.31"
+          }
+        },
+        "string_decoder": {
+          "version": "0.10.31",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
+          "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
+          "dev": true,
+          "optional": true
+        }
+      }
+    },
     "ansi-regex": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-1.1.1.tgz",
-      "integrity": "sha1-QchHGUZGN15qGl0Qw8oFTvn8mA0=",
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
       "dev": true
     },
     "ansi-styles": {
@@ -148,9 +257,9 @@
       "dev": true
     },
     "arraybuffer.slice": {
-      "version": "0.0.6",
-      "resolved": "https://registry.npmjs.org/arraybuffer.slice/-/arraybuffer.slice-0.0.6.tgz",
-      "integrity": "sha1-8zshWfBTKj8xB6JywMz70a0peco=",
+      "version": "0.0.7",
+      "resolved": "https://registry.npmjs.org/arraybuffer.slice/-/arraybuffer.slice-0.0.7.tgz",
+      "integrity": "sha512-wGUIVQXuehL5TCqQun8OW81jGzAWycqzFF8lFp+GOM5BXLYj3bKNsYC4daB7n6XjCqxQA/qgTJ+8ANR3acjrog==",
       "dev": true
     },
     "asn1": {
@@ -186,11 +295,18 @@
       "dev": true
     },
     "assertion-error": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.0.0.tgz",
-      "integrity": "sha1-x/hUOP3UZrx8oWq5DIFRN5el0js=",
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.1.0.tgz",
+      "integrity": "sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==",
       "dev": true
     },
+    "ast-types": {
+      "version": "0.10.2",
+      "resolved": "https://registry.npmjs.org/ast-types/-/ast-types-0.10.2.tgz",
+      "integrity": "sha512-ufWX953VU1eIuWqxS0nRDMYlGyFH+yxln5CsmIHlpzEt3fdYqUnRtsFt0XAsQot8OaVCwFqxT1RiwvtzYjeYeg==",
+      "dev": true,
+      "optional": true
+    },
     "astw": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/astw/-/astw-2.2.0.tgz",
@@ -212,6 +328,12 @@
       "integrity": "sha1-GdOGodntxufByF04iu28xW0zYC0=",
       "dev": true
     },
+    "async-limiter": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.0.tgz",
+      "integrity": "sha512-jp/uFnooOiO+L211eZOoSyzpOITMXx1rBITauYykG3BRYPu8h0UcxsPNB04RR5vo4Tyz3+ay17tR6JVf9qzYWg==",
+      "dev": true
+    },
     "asynckit": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
@@ -230,6 +352,32 @@
       "integrity": "sha1-g+9cqGCysy5KDe7e6MdxudtXRx4=",
       "dev": true
     },
+    "axios": {
+      "version": "0.15.3",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-0.15.3.tgz",
+      "integrity": "sha1-LJ1jiy4ZGgjqHWzJiOrda6W9wFM=",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "follow-redirects": "1.0.0"
+      }
+    },
+    "babel-runtime": {
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz",
+      "integrity": "sha1-llxwWGaOgrVde/4E/yM3vItWR/4=",
+      "dev": true,
+      "requires": {
+        "core-js": "2.5.3",
+        "regenerator-runtime": "0.11.1"
+      }
+    },
+    "babylon": {
+      "version": "6.18.0",
+      "resolved": "https://registry.npmjs.org/babylon/-/babylon-6.18.0.tgz",
+      "integrity": "sha512-q/UEjfGJ2Cm3oKV71DJz9d25TPnq5rhBVL2Q4fA5wcC3jcrdn7+SssEybFIxwAvvP+YCsCYNKughoF33GxgycQ==",
+      "dev": true
+    },
     "backo2": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/backo2/-/backo2-1.0.2.tgz",
@@ -260,12 +408,6 @@
       "integrity": "sha1-R2iMuZu2gE8OBtPnY7HDLlfY5rY=",
       "dev": true
     },
-    "batch": {
-      "version": "0.5.3",
-      "resolved": "https://registry.npmjs.org/batch/-/batch-0.5.3.tgz",
-      "integrity": "sha1-PzQU84AyF0O/wQQvmoP/HVgk1GQ=",
-      "dev": true
-    },
     "bcrypt-pbkdf": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.1.tgz",
@@ -276,12 +418,22 @@
         "tweetnacl": "0.14.5"
       }
     },
-    "benchmark": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/benchmark/-/benchmark-1.0.0.tgz",
-      "integrity": "sha1-Lx4vpMNZ8REiqhgwgiGOlX45DHM=",
+    "beeper": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/beeper/-/beeper-1.1.1.tgz",
+      "integrity": "sha1-5tXqjF2tABMEpwsiY4RH9pyy+Ak=",
       "dev": true
     },
+    "benchmark": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/benchmark/-/benchmark-2.1.4.tgz",
+      "integrity": "sha1-CfPeMckWQl1JjMLuVloOvzwqVik=",
+      "dev": true,
+      "requires": {
+        "lodash": "4.17.5",
+        "platform": "1.3.5"
+      }
+    },
     "better-assert": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/better-assert/-/better-assert-1.0.2.tgz",
@@ -297,6 +449,57 @@
       "integrity": "sha1-RqoXUftqL5PuXmibsQh9SxTGwgU=",
       "dev": true
     },
+    "bitsyntax": {
+      "version": "0.0.4",
+      "resolved": "https://registry.npmjs.org/bitsyntax/-/bitsyntax-0.0.4.tgz",
+      "integrity": "sha1-6xDMb4K4xJDj6FaY8H6D1G4MuoI=",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "buffer-more-ints": "0.0.2"
+      }
+    },
+    "bl": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/bl/-/bl-1.1.2.tgz",
+      "integrity": "sha1-/cqHGplxOqANGeO7ukHER4emU5g=",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "readable-stream": "2.0.6"
+      },
+      "dependencies": {
+        "process-nextick-args": {
+          "version": "1.0.7",
+          "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-1.0.7.tgz",
+          "integrity": "sha1-FQ4gt1ZZCtP5EJPyWk8q2L/zC6M=",
+          "dev": true,
+          "optional": true
+        },
+        "readable-stream": {
+          "version": "2.0.6",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.0.6.tgz",
+          "integrity": "sha1-j5A0HmilPMySh4jaz80Rs265t44=",
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "core-util-is": "1.0.2",
+            "inherits": "2.0.3",
+            "isarray": "1.0.0",
+            "process-nextick-args": "1.0.7",
+            "string_decoder": "0.10.31",
+            "util-deprecate": "1.0.2"
+          }
+        },
+        "string_decoder": {
+          "version": "0.10.31",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
+          "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
+          "dev": true,
+          "optional": true
+        }
+      }
+    },
     "blob": {
       "version": "0.0.4",
       "resolved": "https://registry.npmjs.org/blob/-/blob-0.0.4.tgz",
@@ -304,9 +507,9 @@
       "dev": true
     },
     "bluebird": {
-      "version": "2.11.0",
-      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-2.11.0.tgz",
-      "integrity": "sha1-U0uQM8AiyVecVro7Plpcqvu2UOE=",
+      "version": "3.5.1",
+      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.5.1.tgz",
+      "integrity": "sha512-MKiLiV+I1AA596t9w1sQJ8jkiSr5+ZKi0WKrYGUn6d1Fx+Ij4tIj+m2WMQSGczs5jZVxV339chE8iwk6F64wjA==",
       "dev": true
     },
     "bn.js": {
@@ -324,7 +527,7 @@
         "bytes": "3.0.0",
         "content-type": "1.0.4",
         "debug": "2.6.9",
-        "depd": "1.1.1",
+        "depd": "1.1.2",
         "http-errors": "1.6.2",
         "iconv-lite": "0.4.19",
         "on-finished": "2.3.0",
@@ -343,9 +546,9 @@
       }
     },
     "brace-expansion": {
-      "version": "1.1.8",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.8.tgz",
-      "integrity": "sha1-wHshHHyVLsH479Uad+8NHTmQopI=",
+      "version": "1.1.11",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
+      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
       "dev": true,
       "requires": {
         "balanced-match": "1.0.0",
@@ -370,14 +573,15 @@
       "dev": true
     },
     "browser-pack": {
-      "version": "6.0.2",
-      "resolved": "https://registry.npmjs.org/browser-pack/-/browser-pack-6.0.2.tgz",
-      "integrity": "sha1-+GzWzvT1MAyOY+B6TVEvZfv/RTE=",
+      "version": "6.0.4",
+      "resolved": "https://registry.npmjs.org/browser-pack/-/browser-pack-6.0.4.tgz",
+      "integrity": "sha512-Q4Rvn7P6ObyWfc4stqLWHtG1MJ8vVtjgT24Zbu+8UTzxYuZouqZsmNRRTFVMY/Ux0eIKv1d+JWzsInTX+fdHPQ==",
       "dev": true,
       "requires": {
         "JSONStream": "1.3.2",
-        "combine-source-map": "0.7.2",
+        "combine-source-map": "0.8.0",
         "defined": "1.0.0",
+        "safe-buffer": "5.1.1",
         "through2": "2.0.3",
         "umd": "3.0.1"
       }
@@ -399,55 +603,62 @@
         }
       }
     },
+    "browser-stdout": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.0.tgz",
+      "integrity": "sha1-81HTKWnTL6XXpVZxVCY9korjvR8=",
+      "dev": true
+    },
     "browserify": {
-      "version": "13.3.0",
-      "resolved": "https://registry.npmjs.org/browserify/-/browserify-13.3.0.tgz",
-      "integrity": "sha1-tanJAgJD8McORnW+yCI7xifkFc4=",
+      "version": "16.0.0",
+      "resolved": "https://registry.npmjs.org/browserify/-/browserify-16.0.0.tgz",
+      "integrity": "sha512-+tpc/lBPrDSM/5DOPtKWCRvFDvC66lUKUmjft6JevGS/mhWJwrh/KZ+LsVqzkbTmrjeqAsGDbIQSMZCHPCzUPg==",
       "dev": true,
       "requires": {
         "JSONStream": "1.3.2",
         "assert": "1.4.1",
-        "browser-pack": "6.0.2",
+        "browser-pack": "6.0.4",
         "browser-resolve": "1.11.2",
-        "browserify-zlib": "0.1.4",
-        "buffer": "4.9.1",
+        "browserify-zlib": "0.2.0",
+        "buffer": "5.0.8",
         "cached-path-relative": "1.0.1",
-        "concat-stream": "1.5.2",
+        "concat-stream": "1.6.0",
         "console-browserify": "1.1.0",
         "constants-browserify": "1.0.0",
         "crypto-browserify": "3.12.0",
         "defined": "1.0.0",
         "deps-sort": "2.0.0",
-        "domain-browser": "1.1.7",
+        "domain-browser": "1.2.0",
         "duplexer2": "0.1.4",
-        "events": "1.1.1",
+        "events": "2.0.0",
         "glob": "7.1.2",
         "has": "1.0.1",
         "htmlescape": "1.1.1",
-        "https-browserify": "0.0.1",
+        "https-browserify": "1.0.0",
         "inherits": "2.0.3",
         "insert-module-globals": "7.0.1",
         "labeled-stream-splicer": "2.0.0",
-        "module-deps": "4.1.1",
-        "os-browserify": "0.1.2",
+        "mkdirp": "0.5.1",
+        "module-deps": "6.0.0",
+        "os-browserify": "0.3.0",
         "parents": "1.0.1",
         "path-browserify": "0.0.0",
         "process": "0.11.10",
         "punycode": "1.4.1",
         "querystring-es3": "0.2.1",
         "read-only-stream": "2.0.0",
-        "readable-stream": "2.3.3",
+        "readable-stream": "2.3.4",
         "resolve": "1.5.0",
         "shasum": "1.0.2",
         "shell-quote": "1.6.1",
         "stream-browserify": "2.0.1",
-        "stream-http": "2.7.2",
-        "string_decoder": "0.10.31",
+        "stream-http": "2.8.0",
+        "string_decoder": "1.0.3",
         "subarg": "1.0.0",
-        "syntax-error": "1.3.0",
+        "syntax-error": "1.4.0",
         "through2": "2.0.3",
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@@ -4890,10 +6030,17 @@
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@@ -4903,6 +6050,13 @@
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@@ -4924,6 +6078,18 @@
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+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/to-double-quotes/-/to-double-quotes-2.0.0.tgz",
+      "integrity": "sha1-qvIx1vqUiUn4GTAburRITYWI5Kc=",
+      "dev": true
+    },
+    "to-single-quotes": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/to-single-quotes/-/to-single-quotes-2.0.1.tgz",
+      "integrity": "sha1-fMKRUfD18sQZRvEZ9ZMv5VQXASU=",
+      "dev": true
+    },
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@@ -4933,10 +6099,17 @@
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+      "resolved": "https://registry.npmjs.org/tsscmp/-/tsscmp-1.0.5.tgz",
+      "integrity": "sha1-fcSjOvcVgatDN9qR2FylQn69mpc=",
+      "dev": true,
+      "optional": true
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-      "integrity": "sha1-oVe6QC2iTpv5V/mqadUk7tQpAaY=",
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/tty-browserify/-/tty-browserify-0.0.1.tgz",
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@@ -4965,9 +6138,9 @@
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-      "integrity": "sha1-C6XsKohWQORw6k6FBZcZANrFiCI=",
+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
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@@ -4987,14 +6160,27 @@
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-      "integrity": "sha1-KcVzMUgFe7Th913zW3qcty5qWd0=",
+      "version": "3.3.10",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.3.10.tgz",
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-        "uglify-to-browserify": "1.0.2",
-        "yargs": "3.10.0"
+        "commander": "2.14.1",
+        "source-map": "0.6.1"
+      },
+      "dependencies": {
+        "commander": {
+          "version": "2.14.1",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-2.14.1.tgz",
+          "integrity": "sha512-+YR16o3rK53SmWHU3rEM3tPAh2rwb1yPcQX5irVn7mb0gXbwuCCrnkbV5+PBfETdfg1vui07nM6PCG1zndcjQw==",
+          "dev": true
+        },
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "dev": true
+        }
       }
     },
     "uglify-to-browserify": {
@@ -5005,9 +6191,9 @@
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-      "resolved": "https://registry.npmjs.org/ultron/-/ultron-1.0.2.tgz",
-      "integrity": "sha1-rOEWq1V80Zc4ak6I9GhTeMiy5Po=",
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/ultron/-/ultron-1.1.1.tgz",
+      "integrity": "sha512-UIEXBNeYmKptWH6z8ZnqTeS8fV74zG0/eRU9VGkpzz+LIJNs8W/zM/L+7ctCkRrgbNnnR0xxw4bKOr0cW0N0Og==",
       "dev": true
     },
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@@ -5016,6 +6202,12 @@
       "integrity": "sha1-iuVW4RAR9jwllnCKiDclnwGz1g4=",
       "dev": true
     },
+    "underscore": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.6.0.tgz",
+      "integrity": "sha1-izixDKze9jM3uLJOT/htRa6lKag=",
+      "dev": true
+    },
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@@ -5041,13 +6233,25 @@
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-      "integrity": "sha1-z1k+9PLRdYdei7ZY6pLhik/QbY4=",
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/useragent/-/useragent-2.3.0.tgz",
+      "integrity": "sha512-4AoH4pxuSvHCjqLO04sU6U/uE65BYza8l/KKBS0b0hnUPWi+cQ2BpeTEwejCSx9SPV5/U03nniDTrWx5NrmKdw==",
       "dev": true,
       "requires": {
-        "lru-cache": "2.2.4",
+        "lru-cache": "4.1.1",
         "tmp": "0.0.33"
+      },
+      "dependencies": {
+        "lru-cache": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-4.1.1.tgz",
+          "integrity": "sha512-q4spe4KTfsAS1SUHLO0wz8Qiyf1+vMIAgpRYioFYDMNqKfHQbg+AVDH3i4fvpl71/P1L0dBl+fQi+P37UYf0ew==",
+          "dev": true,
+          "requires": {
+            "pseudomap": "1.0.2",
+            "yallist": "2.1.2"
+          }
+        }
       }
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@@ -5107,6 +6311,13 @@
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       "dev": true
     },
+    "uws": {
+      "version": "0.14.5",
+      "resolved": "https://registry.npmjs.org/uws/-/uws-0.14.5.tgz",
+      "integrity": "sha1-Z6rzPEaypYel9mZtAPdpEyjxSdw=",
+      "dev": true,
+      "optional": true
+    },
     "verror": {
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
@@ -5160,6 +6371,13 @@
         "vow": "0.4.17"
       }
     },
+    "when": {
+      "version": "3.7.8",
+      "resolved": "https://registry.npmjs.org/when/-/when-3.7.8.tgz",
+      "integrity": "sha1-xxMLan6gRpPoQs3J56Hyqjmjn4I=",
+      "dev": true,
+      "optional": true
+    },
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@@ -5173,7 +6391,8 @@
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       "integrity": "sha1-VDjNLqk7IC76Ohn+iIeu58lPnJ0=",
-      "dev": true
+      "dev": true,
+      "optional": true
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@@ -5223,25 +6442,20 @@
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-      "resolved": "https://registry.npmjs.org/ws/-/ws-1.1.4.tgz",
-      "integrity": "sha1-V/QNA2gy5fUFVmKjl8Tedu1mv2E=",
+      "version": "3.3.3",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-3.3.3.tgz",
+      "integrity": "sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==",
       "dev": true,
       "requires": {
-        "options": "0.0.6",
-        "ultron": "1.0.2"
+        "async-limiter": "1.0.0",
+        "safe-buffer": "5.1.1",
+        "ultron": "1.1.1"
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-    "wtf-8": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/wtf-8/-/wtf-8-1.0.0.tgz",
-      "integrity": "sha1-OS2LotDxw00e4tYw8V0O+2jhBIo=",
-      "dev": true
-    },
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-      "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-2.6.5.tgz",
-      "integrity": "sha1-b/etYPty0idk8AehZLd/K/FABSY=",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-3.1.0.tgz",
+      "integrity": "sha1-LIaIjy1OrehQ+jjKf3Ij9yCVFuE=",
       "dev": true,
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@@ -5256,22 +6470,36 @@
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-      "integrity": "sha1-GFqIjATspGw+QHDZn3tJ3jUomS0=",
+      "version": "1.5.5",
+      "resolved": "https://registry.npmjs.org/xmlhttprequest-ssl/-/xmlhttprequest-ssl-1.5.5.tgz",
+      "integrity": "sha1-wodrBhaKrcQOV9l+gRkayPQ5iz4=",
       "dev": true
     },
+    "xregexp": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/xregexp/-/xregexp-2.0.0.tgz",
+      "integrity": "sha1-UqY+VsoLhKfzpfPWGHLxJq16WUM=",
+      "dev": true,
+      "optional": true
+    },
     "xtend": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
       "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
       "dev": true
     },
+    "yallist": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
+      "dev": true
+    },
     "yargs": {
       "version": "3.10.0",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
       "integrity": "sha1-9+572FfdfB0tOMDnTvvWgdFDH9E=",
       "dev": true,
+      "optional": true,
       "requires": {
         "camelcase": "1.2.1",
         "cliui": "2.1.0",
diff --git a/package.json b/package.json
index 3736610f..02b0f118 100644
--- a/package.json
+++ b/package.json
@@ -9,34 +9,34 @@
     "algorithms"
   ],
   "dependencies": {
-    "lodash": "^4.11.1"
+    "lodash": "^4.17.5"
   },
   "devDependencies": {
-    "benchmark": "^1.0.0",
-    "browserify": "^13.0.0",
-    "chai": "^1.9.2",
-    "istanbul": "^0.3.2",
-    "jscs": "^1.7.3",
-    "jshint": "^2.5.6",
-    "jshint-stylish": "^1.0.0",
-    "karma": "^0.13.22",
-    "karma-chrome-launcher": "^0.2.0",
-    "karma-firefox-launcher": "^0.1.6",
-    "karma-mocha": "^0.2.0",
-    "karma-phantomjs-launcher": "^1.0.0",
-    "karma-requirejs": "^0.2.5",
-    "karma-safari-launcher": "^0.1.1",
-    "mocha": "^1.21.5",
-    "phantomjs-prebuilt": "^2.1.7",
-    "requirejs": "^2.1.22",
-    "seedrandom": "^2.4.2",
-    "semver": "^4.1.0",
-    "sprintf": "^0.1.4",
-    "uglify-js": "^2.4.15"
+    "benchmark": "^2.1.4",
+    "browserify": "^16.0.0",
+    "chai": "^4.1.2",
+    "istanbul": "^0.4.5",
+    "jscs": "^3.0.7",
+    "jshint": "^2.9.5",
+    "jshint-stylish": "^2.2.1",
+    "karma": "^2.0.0",
+    "karma-chrome-launcher": "^2.2.0",
+    "karma-firefox-launcher": "^1.1.0",
+    "karma-mocha": "^1.3.0",
+    "karma-phantomjs-launcher": "^1.0.4",
+    "karma-requirejs": "^1.1.0",
+    "karma-safari-launcher": "^1.0.0",
+    "mocha": "^5.0.0",
+    "phantomjs-prebuilt": "^2.1.16",
+    "requirejs": "^2.3.5",
+    "seedrandom": "^2.4.3",
+    "semver": "^5.5.0",
+    "sprintf": "^0.1.5",
+    "uglify-js": "^3.3.10"
   },
   "repository": {
     "type": "git",
     "url": "https://github.com/dagrejs/graphlib.git"
   },
   "license": "MIT"
-}
\ No newline at end of file
+}