AUI-1046 - Add support for NodeJS v0.8+ on Grunt tasks

## v0.11 latest (v0.11.8)
* [✔] grunt init
* [✔] grunt build
* [✔] grunt build:yui
* [✔] grunt build:aui
* [✔] grunt bootstrap
* [✔] grunt all
* [✔] grunt watch
* [✔] grunt create
* [✔] grunt format
* [✔] grunt zip
* [✔] grunt release
* [✔] grunt release-cdn
* [✔] grunt test
* [✔] grunt api-watch
* [✔] grunt api-build

## v0.10 latest (v0.10.21)
* [✔] grunt init
* [✔] grunt build
* [✔] grunt build:yui
* [✔] grunt build:aui
* [✔] grunt bootstrap
* [✔] grunt all
* [✔] grunt watch
* [✔] grunt create
* [✔] grunt format
* [✔] grunt zip
* [✔] grunt release
* [✔] grunt release-cdn
* [✔] grunt test
* [✔] grunt api-watch
* [✔] grunt api-build

## v0.8 latest (v0.8.26)
* [✔] grunt init
* [✔] grunt build
* [✔] grunt build:yui
* [✔] grunt build:aui
* [✔] grunt bootstrap
* [✔] grunt all
* [✔] grunt watch
* [✔] grunt create
* [✔] grunt format
* [✔] grunt zip
* [✔] grunt release
* [✔] grunt release-cdn
* **[✘] grunt test** (couldn't reproduce error because node-gyp isn't supported on Mac OS X 10.9)
* [✔] grunt api-watch
* [✔] grunt api-build