Shadow optimization
Performance improvement by reducing the number of strings created during scene setup and reduce memory used
Performance improvement by reducing the number of strings created during scene setup and reduce memory used
Merge pull request #148 from blanchg/performance2

Improve performance by reducing the number of strings created.
Add zNear property support with DirectionalLight.
Fix default znear value
In Matrix4x4, prevent the signal changed to be fire twice during a lookAt computation.
Merge branch 'dev' of https://github.com/aerys/minko into dev

Conflicts:
	src/aerys/minko/scene/controller/PickingController.as
Merge branch 'dev' of https://github.com/aerys/minko into dev
Fix for orthographic cameras
Merge branch 'dev' of https://github.com/Tortenazor/minko into dev