Navigation improvements (+ home icon svg to png conversion)

Rendering is great now :) (follows discussion started in #5298)

![screen shot 2014-07-31 at 12 56 02](https://cloud.githubusercontent.com/assets/85783/3763887/aac75cb6-18a9-11e4-90bf-e4b46b012bc2.PNG)

![ ](http://www.distractify.netdna-cdn.com/wp-content/uploads//2012/07/FRTEN1RHTQNC269.MEDIUM.gif)