added is_channel_admin? method to application policy
added admin policy class to handle basic admin and channel admin permissions
removing cancan check from contribution reports for project owner
moving admin access control to pundit
removing cancan exception handler
Removing cancan check from menu. Still need to add access control via pundit here
removing ability model
removing cancan gem
Moved menu creation to menu handler included this should close #608 and makes it easier to handle access control.
Merge pull request #610 from diogob/remove_cancan

Remove cancan and menu refactor (now works in development)