GRN2-176: Create a role editor that allows admins to specify what permissions each role has (#709)

* Add roles editor

* Add colour selection ability to roles

* Add ability to assign roles to users in the UI

* Remove rolify and replace it with our own custom roles implemenation

* - Fix all existing roles functionality
- Fix super admins

* Fix bugs with new customers not have default roles

* Add can't create room setting

* Code improvements

* Fix migration

* Add tests for new methods

* Translate reserved role names

* Pull roles from saml/ldap

* Fix rspec

* Fix scrutinizer issues

* Fix email promoted/demoted tests

* Apply comments

* Redirect directly to the main room

* Add comments

app/assets/javascripts/room.js.erb

@@ -39,6 +39,11 @@ $(document).on('turbolinks:load', function(){
         }, 2000)
       }
     });
+
+    // Forces the wrapper to take the entire screen height if the user can't create rooms
+    if ($("#cant-create-room-wrapper").length){
+      $(".wrapper").css('height', '100%').css('height', '-=130px');
+    }
   }
 
   // Display and update all fields related to creating a room in the createRoomModal