working on #1713, use standlone for export

fix bundle ignore

remove browserify standalone and manually export; fixes #1574

Use gulp-sourcemaps and write maps for both debug and release

write sourcemap to separate file

export pixi.js for other bundles to require

fix #1283; allow exclusion of modules

fix bundle on watch update

fix watch tsk

fix some require paths that changed with some refactoring

remove isDev; always output sourcemap; add uglify

initial move to new module folders

it begins; index done, moving to display

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