Remove and ignore Gemfile.lock

See http://yehudakatz.com/2010/12/16/clarifying-the-roles-of-the-gemspec-and-gemfile/ for rationale
Fix runtime vs development dependencies
Whitespace / BeautifyRuby
Add remove_versions function

 - Removes versions according to http://support.hockeyapp.net/kb/api/api-delete-versions