minor perf increase for updateTransform

got textures binding correctly and webgl works

fix update transform for DO so it can be root

fix small build/run issues

move fastSpriteBatch to renderer; add some docs

remove renderSession code; only pass renderer in ctor

fix some jshint issues

merge #1216, small getBounds optimization

update extras to new renderer methods

make texture frame a setter; clear up some typos

move all render webgl code to DOC

move cacheAsBitmap to DOC

reorg webgl utils; move primitives to core; refactor shape types

Lots of core renderer-related updates ...

- Removed `Stage` completely from core lib, in favor of directly rendering
  DisplayObjects
- Removed rendersession from core lib
- Rewrote WebGL managers to be more DRY and have a common base
- Rewrote Shaders to be more DRY and have a common base

fix require paths for browserify

initial move to new module folders