Adapted to the GTK3 requirenments.
Devided components into base part and those, related to the rake application.
Extractrd common part into drawing subpackage.
Refining interface addressing.
Specify exact interface when registering application, since it has at least two: IApplication and zope's IFactory.
Test adapted by IView's provider objects to correspond the correct protocol: first parameter is a model (can be None), second is an IView implementor if it is not None (as for Application).