[fix bug 847461] [Voting] List past/current/future votings.
Merge pull request #364 from akatsoulas/847461

[fix bug 847461] [Voting] List past/current/future votings.
Merge pull request #359 from johngian/761559

[Fix bug 761559] Implement multiple event iCal export
New easter egg
CSS fixes and font updates
[Fix bug 773647] Initial implementation of categories in events

* Change Event model
* Change EventForm form
* Implement UI on edit and view event
* Expose categories in events api
* Implement filter by event
* Changes in unittests to include categories