Add helper for alert with bootstap class
Add configurations for Devise
Add Devise views for customization
Add user model
Add shortcut route for sign up, in and out
Enable sign in button
Fix issue on sign_up
Add button to sign out
Customize Devise views
Merge branch 'develop'
Merge remote-tracking branch 'upstream/master' into rails-base
Merge branch 'rails-base' into develop