installed 'gems' wrapper for rubygems.org API
added test for when user adds invalid gem
added placeholder to input field
User cannot add gem that doesn't exist in the RubyGem API
altered input field placeholder
reduced method responsibilities
removed a comment
name uniqueness now recognizes 'devise' and 'Devise' as the same
altered test - all tests are green
resolved code conflict in Gemfile
Merge pull request #47 from lauyeung/integrated-ruby-gem-api

Integrated ruby gem api