add removeView to webgl destroy; default it to false in both renderers

fix #984, null errehthing on webgl renderer destroy

Add dispose method

merge #1334, fix incorrect sin/cos usage

run jshint in default task

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

Fix typo in fromImage logic ...

This bug was introduced in 1a96f90

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

merge #1300, GC changes for Rope

merge #1301, reset array instead creating new

bump version to 3.0.0