Incomplete "About" dialog

```
The "about" dialog should probably contain the following information:

-License of the data used (CC-BY-SA 2.0)
-License of the software
-version number (and maybe date)
-URL of osmdroid homepage (i.e. http://code.google.com/p/osmdroid)

```

Original issue reported on code.google.com by `misc2...@danielnaber.de` on 5 Apr 2010 at 6:43
