Docs, examples again, test folder, removeAll func

Merge pull request #557 from alvinsight/dev ...

Cleaned the examples and the src a bit, plus docs

Modified trim to be a rectangle instead of point ...

removed trimmed variable on sprite as no longer required
tweaked test to not expect trim to be point

Merge pull request #555 from photonstorm/dev ...

Added PIXI.canvas global object for fill/clear/px rounding

Merged fillRect and clearRect to single clearBeforeRender boolean.

Hoisted the fillRect/canvasRect/pxRound flags to the CanvasRenderer.

Added PIXI.canvas global object which allows for tighter configuration of the canvas renderer. Allows the dev to control if fillRect / clearRect is called (as it's not needed for lots of games and can help perf slightly on legacy devices). Also added PX_ROUND boolean. If true (default is false) it will Math.floor the x/y values on the transform, this stops interpolation when Sprites are rendered at non-pixel values, keeping pixel art crisp. Also helps performance on older mobiles. I removed the view.style.backgroundColor as it was never set, mostly commented-out and is unreliable as hell on Android anyway :( (which I guess is why it had been replaced with the fillRect instead).

Fixed sprite batch issue

Cleaned the examples and the src a bit, plus docs

TilingSprite fixes for CocoonJS, closes #490

Remove all references to mat3 or mat4

Tweaked tiling texture and jshinted code

fixed render texture issue and jshinted code

replaced matrix

Merge branch 'dev' of https://github.com/GoodBoyDigital/pixi.js into dev

Reset Alpha for CanvasRenderer

Dived into WebGLRenderer, fixes and docs

Allow texture to not be flipped

Docs updated ...

Fixed issue where alpha not being set correctly in canvas spriteBatch
Fixed issue where previous stage events did not get removed correctly

Typos and Started tackling the WebGL, and tests

Docs :)

Fixed premultiplied alpha - for webGL transparent canvas

Added clear rect to transparent canvas renderer

Jshinted code

Finished first pass of webGL destroy functions

Jshinted code ...

also tweaked BaseTexture.fromCanvas function

Added fromCanvas to base texture ...

added destroy function to webGLRenderer (WIP)

Fix texture scaling in canvas renderer

Fixed hoever interaciton inconsistency ...

Also changed canvas renderer to use fillRect instead of clearRect as
its faster and works with the new alpha property that canvas has

Fixed scale Issue with text