removing RGBAColorTrait and editor from traits and traits ui; removing RGBAColor as well; changing all references to these (in VET, some traits UI demos, etc.) to reference the RGBAColor trait defined in Enable2; fixing a small versioning error in block canvas's setup.py; adding label_test demo to enable2
removing RGBAColorTrait and editor from traits and traits ui; removing RGBAColor as well; changing all references to these (in VET, some traits UI demos, etc.) to reference the RGBAColor trait defined in Enable2; fixing a small versioning error in block canvas's setup.py; adding label_test demo to enable2

geggo/pyface,pankajp/pyface,brett-patterson/pyface,geggo/pyface