AngularRequireJsSample.zip dependency version issue

The `~` in `"ng-grid": "~2.0.13"` (in `bower.json`) allows the new minor version, `2.0.14`, to be installed instead. This causes the related script tag to 404 and the page load to fail. Using the exact version avoids this issue.

```
15c15
<     "ng-grid": "~2.0.13"

---
>     "ng-grid": "2.0.13"
```
