Add CanCan and abilities schema
Fix issue with WebMock stubbing for development environment
Change app authorization to CanCan
Add more user roles manager and bot
Add manager role supporting. Fix images controller
Exctract shared specs for manager and admin account specs
Add admin user index and show pages
Add links to user managing in admin panel
Add edit user role page
Prevent admin to change his own role
User role was extracted into separated table
Add permissions for an user role
Add roles index and show pages
Add roles permissions customization
Enable dynamic role permissiions