Fixed TilingSprite not render children on canvas

TilingSprite does not render children on 2d canvas. The call to
children's renderCanvas method is missing.
Fix Text.destroy() and fix memory leak in BaseTexture.destroy() if basetexture was from canvas
Implemented animationSpeed for Spine animations.
Default value is 1.
This is simply the "timeScale" value from the Spine runtime, but with a more friendly name.
Add scaleMode params to FilterTexture and RenderTexture
Merge pull request #705 from Cristy94/dev

Reduce getBounds() number of comparisons
Added 2 MovieClip helper functions

- fromFrames and fromImages static helper methods added to MovieClip
- added padding to text if stroke being used
Added Spin Lisence

Also added extra note to display object documentation
Doc tweak for Circle
Merge pull request #661 from giraluna/filterTexture-scaling

Add scaleMode params to FilterTexture and RenderTexture
Merge branch 'dev' of https://github.com/GoodBoyDigital/pixi.js into dev
Fixed Ajax bug for ie9 and ie10
republished and linter code
Fixed a spelling mistake on a local variable.
Merge pull request #715 from MWGitHub/dev

Fixed a spelling mistake on a local variable.
Tweaked JSON Loader window.XDomainRequest
Fixed a minor typo in Sprite constructor documentation

Changed `nex` to `new` and `Sprite.FromImage` to `Sprite.fromImage`
Strip and Rope now working again

added rope example
minor tweaks
Merge pull request #722 from n1313/patch-2

Fixed a minor typo in Sprite constructor documentation
Fixed Graphics blendMode

Graphics blendMode property now works in webGL
Merge branch 'dev' of https://github.com/GoodBoyDigital/pixi.js into dev