Update Foundation, equal height cookbook columns

:fork_and_knife: :fork_and_knife: :fork_and_knife: 
### Update Foundation to 5.2.2

In order to take advantage of some of Foundations newer features this updates Foundation and its JS dependencies to 5.2.2. This also moves `_settings` out of vendor as it contains project specific overrides and shouldn't be overwritten everytime we update foundation.

### Ensure cookbook listing columns are equal height

This takes advantage of Foundation equalizer to ensure that the columns in a cookbook listing are of equal height. This change ensures the following doesn't happen.

![screen shot 2014-05-07 at 8 40 11 am](https://cloud.githubusercontent.com/assets/316507/2902433/b2784e64-d5e4-11e3-9cc0-babc5fb765c7.png)