Added Abilities and Roles for Users
Add ability to check user permissions for current user
Capture exception for unauthorized users
add permission tests for guest and admin
Refactored user validations tests
fix and pass three user validations tests.
add new user validations tests
add a new sign in helper in utility but login page does not work
use expect instead of should in tests
Updating CanCan authorization for controllers
Merge branch 'cancan' of github.com:jamesmarkcook/twizyowners into cancan
Minor spelling corrections