Enabling search on Events.

Enables the search on the Event, both at List and Event level. Using a filter like the category one to include the nav_bar
Adding forgotten template file
Merge branch 'master' into 15-search
Cycling on the Events also in the map.

I've decided to go back t the original plan and cycle on the events, so we can keep our queryset and views slim.
We also have an improvement, we re-use the marker if it's at the same location, and we just update the
popup content with the events link.
Merge pull request #104 from e-Luminate/15-search

Implement search for Event. We miss the Participant search for the #15