merge #760, allow movieclip to loop either direction

merge #911, remove some unused vars

merge #1216, small getBounds optimization

merge #1300, GC changes for Rope

fix up more extras, graphics, and text with new render methods

update extras to new renderer methods

initial move to new module folders

tons of jshint and typo fixes

refactor utils

run clean on strip

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