fix gauth flow
add dashboard style
add roles specific dashboards (admin manager teacher student user)
render menu for different roles
Show user list

+ dashUser service to keep user data
+ dashUser controller for admin to manage users
* User views to display user list
* handle `not implemnt` exception with notification
* Improve notification styles
Merge pull request #8 from Bratops/0.1.5_mockup_dashboards

Mock-up dashboard style