Added Ember 1.2.0-beta.4.
Merge pull request #2146 from rjackson/update_ember_version-1-2-0-beta-4

Added Ember 1.2.0-beta.4.
Update noUiSlider to 4.3.0
[Author] Update HeadJS 0.99

Made some changes to the files since old files still seem to be served
via the CDN, in hoping that changes will overwrite and purge the CDN
cache.
Merge pull request #2149 from leongersen/master

[Author] Update noUiSlider to 4.3.0
Merge pull request #2150 from headjs/master

[Author] Update HeadJS 0.99