toolbar UI updates

* added home icon, because there was no way back to the frontend
* removed separators with summary sections to make browsing with the panel more intuitive
* updated version number display, now also shown as label

### Screens
![bildschirmfoto 2014-02-05 um 01 44 16](https://f.cloud.github.com/assets/649031/2083408/93ca560e-8e01-11e3-8f23-a0793f7e5b13.png)

![bildschirmfoto 2014-02-05 um 01 44 24](https://f.cloud.github.com/assets/649031/2083409/93cd2370-8e01-11e3-80f6-9a5eba768952.png)

![bildschirmfoto 2014-02-05 um 01 43 52](https://f.cloud.github.com/assets/649031/2083410/93cf06c2-8e01-11e3-8da2-01c4597d355c.png)