Users may register with github

* Create integration test to validate that you can register with github
* Add private github secret and key to .env.development
* Create helper module for taking an omniauth hash and returning a user
* Pull displaying flash[:error] into the layout
User may log in with Github
Github login with existing user doesn't create user
Merge pull request #17 from gopher-snakes-2013/user-may-sign-in-with-github

User may sign in with github