made the UI more friendly for small touchscreens (fixing #30)

![screen shot 2013-08-21 at 02 31 15](https://f.cloud.github.com/assets/628602/998279/379c97c0-09f9-11e3-8318-13a32399cc59.png)
![screen shot 2013-08-21 at 02 31 36](https://f.cloud.github.com/assets/628602/998280/3a58efc2-09f9-11e3-9290-94c9beef6e02.png)