This is the first release after migrating the Git repo from stig/json-framework to its new home at SBJson/SBJson.

Changes include:

• Migrating CI from Travis to CircleCI
• Migrated Emacs Org files to Markdown for ease of contribution
• Add Carthage CI test job to avoid breaking it in the future
• Added template Cocoapods podspec
• Add Cocoapods pod lib lint CI step to catch problems early
• Add Cocoapods job to run pod trunk push for releases
• Fixed a test that broke due to filesystem traversal no longer being
  in alphabetical order
• Fixed a signedness issue in the sbjson cli tool
• Swapped NEWS files around so the current one has no version number
• Updated CREDITS
• Updated/automated release procedures
• Removed static NSNumber instances in the writer