Make the Footer Dark 

![footer](https://cloud.githubusercontent.com/assets/6282045/4961651/3ff4e00e-66d1-11e4-94c5-90657d014f78.png)

I think the footer looks better when dark colored, because it adds more contrast. Also I updated the Network Redux logo.

If @tresf and @Lukas-W agree, I'll merge this :)