Fixed shadows in nav flyout

As @joshdjuric required. 

Before:

![screenshot 2014-07-14 18 39 22](https://cloud.githubusercontent.com/assets/1451471/3573754/91945db6-0b75-11e4-8d44-b6d11ab9917f.png)

After:

![screenshot 2014-07-14 18 34 17](https://cloud.githubusercontent.com/assets/1451471/3573753/91918550-0b75-11e4-8a32-a7b9e0c366d6.png)