Merge pull request #7 from doubleday/master

scale9 extension doesnt render top part.
CCLayer/ CCNode: Cleaning up how default camera is set
CCLayerColor: Fixing up how vertices are updated

* Need to make use of visible bounds' origin in case origin is not (0,0)
Small cleanup of TiledGrid3D:

* Fixing up rounding errors
CCDrawManager: changing default clear colour
CCGrid3DAction: Fixing regression with how grid3d was created

* should follow some approach as tiled3daction
Tests: Fixing up EffectsTests
CCCamera/CCLayer: Fixing rounding errors when using 3d camera to target a 2d bounds

* Increasing the default near clipping plane helps to reduce numerical errors