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
Fixed Tiling Sprite bug
Compensates for the pivot point to prevent it from altering the X and Y coordinates