cretae /ui namespace for angularjs application
* move github/user_session and gitlab/user_session to user_session ns
* wrap Rails.configuration.x.hostname with URI
* add omniauth_authorize_url helper
* create github/user_session#sign_up and sign_in actions
refactor sign_in page
add Sign Out
* remove welcome controller
* create layout for sessions
* create sign_up template
Merge pull request #18 from vexor/namespaced_ui

Namespaced ui