Permission Nodes

[ShawnClake]

Add the concept of Permission Nodes to UE.

Included features:

• Be given on a Role/Group basis. See #101
• Be given on a per user basis.
• Create functions in Module.php and UserUtil (All 3 apply to the logged in user):
  • hasPermission($nodeCode)
  • hasRole($roleCode)
  • hasGroup($groupCode)
• Add a backend controller for creating, removing, and updating permission nodes

[ShawnClake]

This can use a very similar to concept the route restrictions.