fix #984, null errehthing on webgl renderer destroy

Add dispose method

merge #1334, fix incorrect sin/cos usage

update colorAttribute to be aColor

fix some require paths that changed with some refactoring

fix some jshint issues

merge #1326, add setter and uniform for offset in frag shader

rename shader classes

merge #1313, fix multi-path masks in canvas

merge #1186, implement fixes for video texture in FF

move primitives back into core

Merge branch 'master' into dev

v2.2.3, fix an issue with pixi publish

sync versions in code

Merge branch 'master' into dev

Fix typo in fromImage logic ...

This bug was introduced in 1a96f90

Fix #1324, update TilingSprite Texture correctly.

merge #1192, allow filters to go 'offscreen'

merge #1265, change manager to act on generic DOM

merge #1274, add error listeners to some loaders

merge #760, allow movieclip to loop either direction

minor tweaks to shader attrs

merge #911, remove some unused vars

merge #969, fix a logic error in spine impl

merge #1052, fix EJECTA issue where renderbuffer isn't reset

merge #1113, reuse code in autoDetectRecommendedRenderer

merge #1171, use gl.isContextLost()

merge #1176, fix regression in RenderTexture

merge #1193, fixes for Base Texture loading code

merge #1216, small getBounds optimization