updateSourceImage added, new flterbounds function added
Merge branch 'dev' of https://github.com/GoodBoyDigital/pixi.js into dev

Conflicts:
	src/pixi/renderers/webgl/WebGLFilterManager.js
	src/pixi/textures/BaseTexture.js
Merge branch 'dev' of https://github.com/GoodBoyDigital/pixi.js into dev