Remove user hero image

We will only have the map on the user page.

I have to make a change on user's edit profile page, so it looks like this now:

![screen shot 2014-03-15 at 12 11 55 am](https://f.cloud.github.com/assets/230476/2427512/a68e56c6-abef-11e3-9527-1b2533c72a02.png)

It closes #62.