Removed icons in mobile Footer

This footer thing gets way to big for phones used in landscape mode.
I think these icons are not essential for the user experience. So I removed them.
(see #259 too)



Before:
![landscape_before](https://f.cloud.github.com/assets/2886317/2335104/5d48db9c-a480-11e3-8be3-6ad98a879548.png)

After:
![landscape_after](https://f.cloud.github.com/assets/2886317/2335107/63e85144-a480-11e3-9ffb-07b979dacbf8.png)

And for portrait mode it looks fine too:

![portrait_after](https://f.cloud.github.com/assets/2886317/2335115/794528e6-a480-11e3-88d3-b515ad3afa14.png)
![portrait_before](https://f.cloud.github.com/assets/2886317/2335116/7947f3be-a480-11e3-85a7-7873c6fb8b31.png)


Cheers,

Christian