Map and List for events

This Pull Request implement the ability to display our events on the map and fix #48 

I'm not sure if we have a mockup of the page, but below you can see how it looks like.
Of course this needs more styling

#Map
![Screenshot from 2013-02-01 18:12:12](https://f.cloud.github.com/assets/96245/119189/18a0c158-6c9b-11e2-9803-deae8994937f.png)
#List
![event_list](https://f.cloud.github.com/assets/96245/119191/1ededc62-6c9b-11e2-9a1c-1ba80b257ab4.png)