A few test changes...
Update InteractionManager.js
fixed canvas render texture issue

works if matrix is null
Separated out the canvas buffer class
canvas buffer removed from canvas renderer class
removed the renderStrip function from CanvasRender
CanvasRenderer Clean up
fixed rendertexture bug
merge #1028
fix some weird parens
Merge branch 'agamemnus-patch-9' into dev
Merge branch 'dev' of github.com:GoodBoyDigital/pixi.js into dev