convert pixelate and invert filters

Add some docs to shockwave filter

add shockwave filter

convert more filters

convert ColorMatrix and ColorStep filters

Add a TODO for ascii filter

update ascii filter

enable ascii filter

Fix requires and readFiles in filters

convert ascii filter

refactor filters to have separate files for shaders

moved filters to filter folder

filter arrays now working correctly

added todo to bloom

Added clear function to applyFilter

fixed Alpha mask

More filter stuff. ...

theres a bloom now..

big changes ...

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

filter restructure ...

now “works” but lots more to do..

remove FilterBlock, it seemed unused

fix broken strings from the regex

regex replace braces to newline

merge #1336, fix typo in convolution filter

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

update docs a smidge

fix require paths for browserify

initial move to new module folders

tons of jshint and typo fixes

refactored the filters

Initial Reorganization ...

This commit was the first to start the rewrite of PIXI

1. Removes meta files not necessary to be in the core repo (docs,
examples, random trim/ folder, etc)
2. Rewrite grunt workflow to be gulp
3. Setup testing and browserify tasks to prepare for code rewrite
4. Trim trailing space from the readme