Set explicit ruby version to '2.0.0' in Gemfile
Update versions of gems and add production group
Add Gemfile.lock
Revert "Update versions of gems and add production group"

This reverts commit e840f89435e2a2f3271e7060a74237fc110e4af0.
Add Gemfile.lock
Add development and production gems to Gemfile
Removed explicit ruby version from Gemfile
Added test group to development group in Gemfile
Server static assets
Lock versions of gems and add test group to Gemfile
Improve the README