fix typo in client/_index.html

Scott,
There was a small typo in the client/_index.html file that, after being generated, prohibited the index.html file from being rendered. On line 19 of that file the code reads:
```
<script src="lib/ng-Fx/dist/ng-Fx.js"></script><% } %>
```

when it should read:

```
<script src="lib/ng-Fx/dist/ngFx.js"></script><% } %>
```

Here is a screenshot of the typo:
![screen shot 2014-07-13 at 9 08 54 pm](https://cloud.githubusercontent.com/assets/6327569/3567045/61bb9a4a-0b0d-11e4-8730-c3d901256570.png)

and of the error message in the console after the generator was done:
![screen shot 2014-07-13 at 9 09 17 pm](https://cloud.githubusercontent.com/assets/6327569/3567049/845c6d04-0b0d-11e4-964b-1268c99d81fa.png)

I hope you find this useful. Thanks for an awesome generator!
Forrest