Get Foundation mobile nav working.

Remove the foundation-rails gem and use the source Zurb provides in vendor.

Move the JavaScripts to the bottom of the body.

Here is what it looks like :sparkles::
![screen shot 2014-02-08 at 10 29 08 am](https://f.cloud.github.com/assets/928367/2117547/db17b32c-90d5-11e3-810e-c82b63c59f43.png)