Depecrate `PIXI.math` namespace ...

Access math members from PIXI when outside of core, require the math module directly when inside of core.

Remove internal filter aliases on PIXI.filters, expose on PIXI instead as PIXI.AbstractFilter ...

These are undocumented and unecessarily create a tight coupling between core and filters where the filters package is actually responsible for exposing an internal core module.

fix typo in convolution filter

fix #1799; vColor should be a vec4 in normalMapFilter

more doc clean ups..

fixed extends doc issue

blur tweaks

tweaked blur filter back to how it was.. ...

direction blur is cool - but this version is way faster..

standardizing annotations

5x5 to 5x4, fixed some wording and general cleanup

Merge branch 'dev' of https://github.com/GoodBoyDigital/pixi.js into dev ...

Conflicts:
	src/filters/color/ColorMatrixFilter.js

Commas and formatting, stupid IE9

Merge pull request #1654 from spaceribs/blurfix ...

Gaussian Blur concept

restored original delta value in smartblur

smartBlur now using delta as uniform rather than const

Merge branch 'dev' of https://github.com/GoodBoyDigital/pixi.js into blurfix

last update based on feedback from #opengl, technically this is back to a 5x4 that's closer to AS3's documentation, but it's more correct than anything else I've seen.

first draft of the gaussian blur fix

I think that I modified this correctly after reviewing the documentation here: http://docs.rainmeter.net/tips/colormatrix-guide and here: https://msdn.microsoft.com/en-us/library/windows/desktop/ms533875(v=vs.85).aspx

tweaked Displacement Map documentation

full colorMatrix support

fix const usages in plugins

fix an error in color matrix filter

remove some lingering .bind()s that are no longer needed

merge #1531

Reference issue for all fs requires (fixes typo as well)

Fix all the remaining jshint stuff

tweaked dropShadow

blurY tweaked

tweaked blur