Add back and forward buttons

![](http://f.cl.ly/items/0f05362B2R3C0z2U1y32/Image%202015-01-01%20at%202.00.05%20PM.png)

We'll probably want to show if there is a back or forward route available... but that can come down the road. 

Also @nerdpruitt this header needs some serious attention now. it's filling up