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