ENH: Extension now does not require any changes to current Slicer code. Unit test now does not cause memory leaks.

In initializing the qMRMLTransformSliders widget, I'm now making use of the Q_PROPERTY mechanism which is already built into Slicer.
Merge branch 'master' of https://github.com/giogadi/PortPlacement

Conflicts:
	PortPlacement/PortPlacement.py