Github link  -

[Pivotal tracker story](https://www.pivotaltracker.com/story/show/66322520)
* Added integration test to test the setting of `github_profile_url`
* refactored the `link_github_profile` method in `authentication_controller` 
* refactored the `authentication_controller_spec` 

Yaros old message in https://github.com/AgileVentures/WebsiteOne/pull/258
cukes + steps 'profile.feature'
view + specs 'users/show'

linking github profile: code + specs 'authentications_controller'
migration to add 'github_profile_url' to User model