Feature/settings dialog

Preview:

![screen shot 2014-01-25 at 11 13 05](https://f.cloud.github.com/assets/845425/2001417/7125eb78-85a9-11e3-9ce7-202148fef886.png)
![screen shot 2014-01-25 at 11 13 13](https://f.cloud.github.com/assets/845425/2001418/7129fdd0-85a9-11e3-98fe-a88a69c060c0.png)