Sheepishly add previously-ignored Gemfile.lock

Was working on a bunch of gems and stupidly added Gemfile.lock
to my global gitignore!

Refer to:
http://stackoverflow.com/questions/4151495/should-gemfile-lock-be-included-in-gitignore
Update my local copy.
Merge branch 'master' of https://github.com/mcantor/github_follower_app