Cairngorm Code

* the classes that were suffixed and prefixed Test that were not FlexUnit TestCase were renamed :
** PopUpBaseTest.as --> PopUpBaseTestable.as
** TestItem.as --> Item.as
* [Test] metadata was added when necessary

But there are still failing test with the observer library :
[WARNING] Unit test com.adobe.cairngorm.observer.SelectableChildProviderTest failed.
[WARNING] Unit test com.adobe.cairngorm.observer.ChildProviderTest failed.
[INFO] ------------------------------------------------------------------------
[INFO] Tests run: 10, Failures: 0, Errors: 2, Time Elapsed: 0 sec
[INFO] ------------------------------------------------------------------------