Plug Memory Leaks

This Pull Request:

* Removes the return value of ```view.show()``` to suppress warnings.
* Removes the return values in the logger tests to suppress warnings.
* Has ```entry``` tear down the manager when the page closes the root class, which causes all workers to be destroyed.
* Adds a ```DEBUG_BACKREF``` field to the anonymous closure created by ```util.handleEvents``` so that you can see what object an event is attached to.
* Deletes a few references that were preventing data structures from being garbage collected because of outstanding event listeners.
This was general cleanup to remove warnings that were showing up in the firefox console when running integration tests. In particular, the view tests have conform warnings, because the promise return of the call to view.show was the iframe object, while the declared interface has no return value.