#130 - Added the new oauth2_provider as a gem.
* Also updated oauth2_proider.gemspec to match the filename extension in gemspec to the actual file.
* Steps to add the engine as a gem - (1) Add gem name and path to rails.new Gemfile. (2) Go to rails.new folder and run command '../../../../tools/bin/go.jruby -S bundle install --standalone --path vendor/bundle'.
#130 - Updating oauth2_provider.gemspec
#130 - Fixed path for app in oauth2_provider.rb and added oauth2_provider in application.rb