in sync with pixi.js:dev@9dab185
fixing a few old problems
some minor fixes
matrix fix
trying to get primitives to work
tilingsprite works
added text back; web-only for now
added getGlobalX/Y
graphics within hidden parents shouldnt be drawn
more visibility fixes for non-batch display items
fixed childIndex bug when removeChild is called
`childIndex` => `getChildIndex()`
fixed canvasrenderer crash (js2coffee translation issue)
fixes for renderSpecific
fix canvas render graph traversal
hmph...
disable antialiasing
isAbove utility method
removed unused color property for now
fixed wrapping bug