fixed SSL_read error

Merge pull request vapor-community#53 from alirp88/master

Remove characters because of deprecation

ctls target dep

Merge pull request vapor-community#51 from vapor/swift4

Swift4

Merge pull request vapor-community#49 from vapor/external-host

ensure that external hostname is set for stricter servers

Merge pull request vapor-community#48 from vapor/global-initializatio…

…n-sync

ensure global context initialization is thread safe

Merge pull request vapor-community#46 from vapor/ssl-errors

Extract error messages from the SSL error queue

Merge pull request vapor-community#44 from vapor/ssl-write-fix

ssl write fix

Merge pull request vapor-community#43 from vapor/two

package/readme

Merge pull request vapor-community#42 from vapor/write

write