update docs a smidge

fix up more extras, graphics, and text with new render methods

update extras to new renderer methods

make texture frame a setter; clear up some typos

move all render webgl code to DOC

minor event target speed boost

minor style tweaks

move cacheAsBitmap to DOC

move primitives back into a separate module

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

successful removal of globals and _dirty flags

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

tons of jshint and typo fixes

refactor utils

run clena on webgl shaders

run clean on strip

run clean on interaction

run clean on utils

run clean on textures

run clena on text

run clean on webgl renderer

cleanup canvas renderers

refactor primitives

refactor loaders

refactored geom

refactored the filters

fix some docs

browserify display objects