add location for Ruvetia #1

I just booked a table for 10+ people at the Musigbistrot in Bern. This PR displays the location on the map:

 
![Screen Shot 2013-03-06 at 11 52 42](https://f.cloud.github.com/assets/5402/227014/204192dc-864c-11e2-8f19-d4e85e184f96.png)