Update test specs to use Jasmine 3 (#2089)

* Updated Karma and Jasmine versions

* Added DOMObserver class. Supports promise-based testing of DOM changes

Update asynchronous test specs to use promises or done() instead of waitsFor/runs

* Modified ActionCapability to duplicate context object properties as own properties for better object equality comparisons

* Global find + replace to fix syntax issues

* Fixed various issues caused by non-deterministic runtime order of tests in Jasmine 3. Fixed issues caused by changes to determination of object equality

* Addressed review comments

* Resolved merge conflicts with master

* Fixed style errors

* Use spy.calls.count() instead of manually tracking

platform/features/layout/test/elements/LineHandleSpec.js

@@ -39,7 +39,7 @@ define(
                     useGrid: true
                 };
                 mockElementProxy = jasmine.createSpyObj('elementProxy', ['getGridSize']);
-                mockElementProxy.getGridSize.andReturn(TEST_GRID_SIZE);
+                mockElementProxy.getGridSize.and.returnValue(TEST_GRID_SIZE);
 
                 handle = new LineHandle(testElement, mockElementProxy, 'x', 'y', 'x2', 'y2');
             });