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/FixedProxySpec.js

@@ -37,7 +37,7 @@ define(
                 mockDialogService = jasmine.createSpyObj('dialogService', ['getUserInput']);
                 mockPromise = jasmine.createSpyObj('promise', ['then']);
 
-                mockQ.when.andReturn(mockPromise);
+                mockQ.when.and.returnValue(mockPromise);
 
                 proxy = new FixedProxy(mockCallback, mockQ, mockDialogService);
             });
@@ -54,7 +54,7 @@ define(
                 // Callback should not have been invoked yet
                 expect(mockCallback).not.toHaveBeenCalled();
                 // Resolve the promise
-                mockPromise.then.mostRecentCall.args[0]({});
+                mockPromise.then.calls.mostRecent().args[0]({});
                 // Should have fired the callback
                 expect(mockCallback).toHaveBeenCalledWith({
                     type: "fixed.box",