Brazil world cup

Adds a bunch of hero images and a new banner for the upcoming world cup. Related Waldorf PR: https://github.com/lonelyplanet/waldorf/pull/1235

![belo-horizonte](https://cloud.githubusercontent.com/assets/708296/3103328/da911784-e654-11e3-9950-c47402deb30c.png)
![brasilia](https://cloud.githubusercontent.com/assets/708296/3103329/daa04dda-e654-11e3-9e29-6b9d2573518a.png)
![cuiaba](https://cloud.githubusercontent.com/assets/708296/3103330/daaa73e6-e654-11e3-836b-0f56baafe5f1.png)
![curitiba](https://cloud.githubusercontent.com/assets/708296/3103331/daaac88c-e654-11e3-950c-9801cd5ed46c.png)
![fortaleza](https://cloud.githubusercontent.com/assets/708296/3103332/daabfb4e-e654-11e3-869b-c10ecff33818.png)
![manaus](https://cloud.githubusercontent.com/assets/708296/3103333/daac8e10-e654-11e3-9dee-26c9875d9ff6.png)
![natal](https://cloud.githubusercontent.com/assets/708296/3103334/daad8338-e654-11e3-8301-ba560e6e6fe5.png)
![porto-alegre](https://cloud.githubusercontent.com/assets/708296/3103335/daaeff92-e654-11e3-9a7f-539477c3bd86.png)
![recife](https://cloud.githubusercontent.com/assets/708296/3103337/dab95bea-e654-11e3-9d79-bf4ab5c6dab5.png)
![salvador](https://cloud.githubusercontent.com/assets/708296/3103336/dab9538e-e654-11e3-9859-2084951f0cb7.png)
![sao-paulo](https://cloud.githubusercontent.com/assets/708296/3103338/daba9442-e654-11e3-9e23-e3edff9a7041.png)