Use of a factory for control instantiation
Merge branch 'next' of git://github.com/blackberry/GamePlay into controls_factory

Conflicts:
	gameplay/src/ImageControl.cpp
Renaming ControlCreator into ControlActivator and correcting missing
return value in ControlFactory::registerCustomControl
Merge remote-tracking branch 'blackberry/next' into controls_factory

Conflicts:
	gameplay/CMakeLists.txt
Merge pull request #1214 from Pixelized/controls_factory

Use of a control factory to instantiate controls (follow-up of #1192)