Update configuration.haml

That ain't YAML. This is YAML.
Merge pull request #286 from bhardin/patch-1

Update configuration.haml
Clean up Commenter and CommentingPolicy specs

* Remove specs testing logic currently tested in `CommentingPolicy`
  specs from `Commenter`
* Don't stub unused and nonexistent methods in `CommentingPolicy` specs
Rename CommentingPolicy spec to have suffix

Tighten up some lines that dont need to wrap beyond one line.
Post Travis build status to #hound

* Notify on build failure
* Notify on first success after previous failure
* Revert to original purple