Allow bugs to be closed from language in GitHub commit message

Allow bugs to be closed from language in GitHub commit message

Many GitHub integrations allow issues to be closed as well as just linked through commit messages.

Ideally:

"Closes [JD-34] added email address to form"

would not only link the commit with bug JD-34, but also close the bug in Zoho.

In fact, Pivotal Tracker responds to several commands (which all do the same thing). It's a handy automation which just saves a little bit of time, and more importantly, keeps everything automatically in sync.

[(Finishes|Fixes|Delivers) #TRACKER_STORY_ID]