Only render children, if it has some (DisplayObject does not)
trying to follow coding style
Merge pull request #168 from englercj/bugfix-166-children

Fix issue with CanvasRenderer trying to render DisplayObject children
Update raf polyfill, fixes #112
map the pixi version of raf
Merge pull request #169 from englercj/dev

Update raf polyfill, fixes #112
Make the measure text not wrap, fixes #170
Merge branch 'dev' of github.com:englercj/pixi.js into dev
Merge pull request #171 from englercj/dev

Add absolute positioning to the measure div
Merging bugfixes from upstream.