added gem dotenv to gemfile for uploading environmental variables for forthcoming bitly functionality
Merge pull request #4 from KevinFalank/dotenv

added gem dotenv to gemfile for uploading environmental variables for fo...
Added Oauth for user signin via Twitter
established current_user
Added validation to prevent duplicate users
Merge pull request #8 from KevinFalank/oauth

Added Oauth for Twitter
Merge remote-tracking branch 'origin' into create_challenge

Conflicts:
	Gemfile.lock
	app/controllers/application_controller.rb
	config/routes.rb