Basic plane geometrie added.
Merge branch 'master' of git://github.com/happah-graphics/happah
Merge branch 'master' of git://github.com/happah-graphics/happah
Plane: Basic SceneManager / Node functionality for Plane implemented.
Merge branch 'master' of git://github.com/happah-graphics/happah
and renamed class GeometryObject as Geometry

Conflicts:
	happah/gui/GUIManager.cpp
	happah/scene/SceneManager.cpp