move rewrite TODO to top of readme

refactored geom

refactored the filters

Add checklist of folders to convert

update some meta files

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

Typos...

Fix typos in README

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fix a typo in readme; closes #877

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merge dev

Docs, examples again, test folder, removeAll func

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merge dev into master

Add build status to README

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adding google analytics

Add contributing information

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