Preparing 1.1.3 dev branch
Add a postUpdate function to plugins, which is called after World.postUpdate
fix #154 Button now goes back to over state when setFrames used in action
Mouse property to say what button is being clicked

It follows the convention that already was in the
file 0 for left, 1 for middle and 2 for right.
It also changes to -1 when mouseUp.
Check type uses the static values
fix typo
getAnimation and RAF callback ID checks added
Merge pull request #167 from wKLV/dev

Mouse now knows what button is clicked
Merge pull request #162 from beeglebug/button

Button now goes back to over state when setFrames used in action
Merge pull request #160 from cocoademon/camera_shake

Add a postUpdate function to plugins
Mouse handler updates.
Input Handler updates, orientation screen and World visibility
Added Tetris sprites
ArcadePhysics.updateMotion applies the dt to the velocity calculations as well as position now (thanks jcs)
Polygon & drawPolygon method
Added some docstring to the Polygon class
Merge pull request #176 from rjimenezda/dev

Polygon class & drawPolygon method
Tidying up some docs.
Updated to latest version of Pixi.js. Lovely new WebGL filters now working happily :)
Tracked down an evil bug in Group.swap that caused the linked list to get corrupted in an upward (B to A) neighbour swap.