defunkt/github-gem — pull request #90 by spikegrobstein (2012-11-01 22:48:10+00:00)
Title: added support for the compare view URL

documented @ https://github.com/blog/612-introducing-github-compare-view

usage:
github compare [start_ref] [end_ref]

opens, in a web browser, the compare view for the passed refs. end_ref
can be omitted to compare to master.