Sifter support appears.
An clarifying comment.
Updated the Sifter service docs.
Merge branch 'sifter' of github.com:nextupdate/github-services into sifter
add simplified JazzHub services, will replace RationalTeamConcert eventually
Added a new service hook for Docker (http://www.Docker.io)
added maintainer and supporter information to the Docker service hook.
add a link to the new payload
Set a better message for #required_config_value.
Fixed issues with Docker service hook, updated to use the new payload, and also fixed unit test
support issue_comment event on irc service
Merge pull request #607 from kencochrane/master

Request to add a Docker service hook
Merge pull request #610 from JLarky/master

LeChat integration
modified the API so that it sends the raw commit message to Freckle for further processing
renamed user to author_email
Improve IRC steps
Properly handle it when override URL is not filled in.

Also, update docs to drop a typo and reword.
Merge pull request #612 from soh335/feature/irc_issue_comment

support issue_comment event on irc service
support pull_request_review_comment event on irc service
support commit_comment event on irc service