Fix CDNify, closes item:35

CDNify's Angular.

Will add JSDelivr support later (once some upstream bugs have been resolved),
at which point, we should be able to CDNify all vendor scripts.

Based off #98 and #99, so review them first.

**Note** run the following (as my patch has just been merged):

```bash
rm -rf node_modules/grunt-google-cdn
npm install
```