Unused properties in WebGLMaskManager constructor

Right-left buttons differentiation ...

Left | Right
-----|--------
mousedown | rightdown
mouseup   |  rightup
mouseupoutside   |  rightupoutside
click   |  rightclick
__isDown   |  __isRightDown

Names can easily be changed from the code.

Unused property in WebGLGraphics.renderGraphics method

Double assingment in Graphics.drawPath mathod

Guards against the texture crop width/height being zero (which crashes IE11)

Fixed references to global variables (window, document) that prevent Pixi from being loaded into environments that don’t necessarily have these available (like Node)

Merge pull request #851 from FedeOmoto/dev ...

When handling a restored webgl context event, save the newly created context and remove the lost one

Prefer bind over 'var scope = this;'

added getImage function to renderTexture ...

Also added getBase64 function to render texture.
Useful for saving out images into HTML world

Circle getBounds width and height corrected

Forwarding the ‘preserveDrawingBuffer’ argument from the autoDetectRenderer to the WebGLRenderer

Merge pull request #876 from JaapRood/master ...

Fixed destroying of WebGLRenderer

Missing originalEvent property on InteractionManager.onMouseOut method

Commented out references of the primitive batch in the WebGL renderer

Added destroy method to prototype of StripShader

simplify matrix apply methods

Merge pull request #856 from lucbloom/matrix-apply-applyInverse ...

The matrix "apply" function

Fixes #870 ...

Rounded rect now works in webGL

Remove duplicated statement

Remove trailing commas from object property lists ...

Removing trailing commas for:
- internal consistency;
- compatibility with the Google Closure compiler defaults.

The Google Closure compiler assumes ECMAScript 3 and emits errors when
parsing objects with trailing commas in their property list.
(Compilation succeeds if the user manually specifies ECMAScript 5.)

Added 0 width check to DisplayObjectContainer

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

Fixed typo in URL

`this.textureChange` is no longer used in any object, anywhere within Pixi, so this check now appears to be redundant - and is changing the internal class shape of Pixi.Sprite as a result (adding a property that doesn't exist).

Tied up new webGL batch approach ...

now 400% faster when dealing with separate textures

First pass of speed up

Tweaked Arc function ...

fixes #844

Text width and height issue fixed ...

Text width and height now returns the correct values

Improved handling of children removal from empty DisplayObjectContainers ...

Calling removeChildren() on an already empty DisplayObjectContainer should not fail with out of range error, but do nothing (as the container is already empty) and return an empty array of removed elements for consistency.

ImageLoader documentation fixes