Clean up comments.
Rspec-mock is a rspec-rails dependency. There's no need to declare it in Gemfile.
Remove debugger dependency since it doesn't work with ruby 2.0.
Gemfile lock
Remove unused gems. This is an API only app. No need to asset management.
Only require sqlite3 under development and test environment.
Merge pull request #2 from rcillo/rd-cleanup-gems

Cleanup Gemfile