bundler/bundler — pull request #3140 by bak (2014-08-18 21:36:44+00:00)
Title: Document git_source method in gemfile man page

Resolves #3125. Also documented `bitbucket` and `gist`, since `github` is explicitly documented. It looks like `git_source` has been documented on the [git page](http://bundler.io/git.html) of the website.