working on #1713, use standlone for export

fix bundle ignore

merge #1575

remove browserify standalone and manually export; fixes #1574

Upgrade browserify, and use karma-browserify and karma-chai

Merge pull request #1554 from drkibitz/feature/docs ...

Feature/docs

change karma path to pixi build ...

gulp build pixi to bin/pixi.js

exclude polyfills from docs

ignore third-party scripts in jsdoc

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

write sourcemap to separate file

change jsdoc task to run npm script

export pixi.js for other bundles to require

update jsdoc to go through all src

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

forgot some gulp files

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