[Representation] Handle edge cases

Handle edge cases (e.g. directive priorities, race conditions)
to ensure that mct-representation and mct-include display correctly
when added to or removed from the DOM.

platform/representation/src/MCTInclude.js

@@ -84,6 +84,9 @@ define(
                 // Use the included controller to populate scope
                 link: link,
 
+                // May hide the element, so let other directives act first
+                priority: -1000,
+
                 // Two-way bind key, ngModel, and parameters
                 scope: { key: "=", ngModel: "=", parameters: "=" }
             };