Fixed line-height style not applying to search icon

The line-height style that applies to the nav bar uses .navbar-nav>li>a . However, the html for the search icon is structured .navbar-nav>li>div>a . This causes the search icon to appear lower compared to the notification bell and for the element footprint to overflow the nav bar.
![screenshot 2014-08-01 17 36 09](https://cloud.githubusercontent.com/assets/2680117/3785438/58245dee-19c4-11e4-87b6-95506adc2358.png)