big changes ...

all still a little in flux!
sprite masks added..

filter restructure ...

now “works” but lots more to do..

tweaks for webGL filter

fixed up renderTexture ...

Works with the new RenderTarget

Merged StencilManager into MaskManager

Fixed up renderTexture

all working now ...

fixed up a few issues with objectRenderers

regex replace braces to newline

fix issues with shaders not compiling properly

fix small build/run issues

move TextureUvs to textures/

Add some docs for source

remove need for global webglRenderers array

Add dispose method

fix some jshint issues

merge #1186, implement fixes for video texture in FF

Fix typo in fromImage logic ...

This bug was introduced in 1a96f90

merge #1176, fix regression in RenderTexture

merge #1193, fixes for Base Texture loading code

make texture frame a setter; clear up some typos

minor style tweaks

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