[#67062772] Initial Gemfile clean-up

I left most of the old gems that I'm not sure about commented out in
there.
[#67062772] Add facotry_girl to the Gemfile
[#67062772] Move jquery-rails to the assets group
[#67062772] Gemfile updates

Also adding a .ruby-version, .ruby-gemset
[#67062772] Add faker to Gemfile, rearrange groups
Merge pull request #4 from cloudspace/67062772_research_gems

67062772 research gems