Fixed world drag support and other input modifications.
Small refactoring and massively optimised the canvas renderer, also added new Mat3 class.
cameraView working for center rotated sprites, just need to handle any point of rotation.
Working sprite bounds / vertices regardless of scale or rotation
Finally a fully working bounding box that respects scale  and rotation - the "in camera" check is now 100% accurate :)
Added ability to detect if a given point is within a sprite or not, taking rotation and scaling into account.
Added Group.bringToTop and updated Input component to use sprite getXY handler.
Fix assets path.
Add assets for tests and a simple camera scroll test.
Merge branch 'photonstorm/097'