[Mobile] Clean-Up

Cleaned the unused code for the
backArrow and long touch gestures.
Commented out functions for later use
Currently shows the back arrow, however,
only will print to console on press.
Edited tests where mobile checks were breaking
and fixed.

platform/commonUI/general/test/controllers/TreeNodeControllerSpec.js

@@ -187,7 +187,9 @@ define(
             });
             
             it("check if tree node is in a mobile device", function () {
-                controller.checkMobile();
+                if (controller) {
+                    controller.checkMobile();
+                }
             });
         });
     }