This is incomplete as events etc are not implemented yet, but should suffice as a decent starting point

Closes #27, but we should track this for new apps

* Models and admin page for events
* Add organisers to events
* event overview page for organisers

Output is cleaned with `bleach` in the frontend

Contains page with overview of partners
Contains admin of partners

This should probably be replaced again soon by something nicer,
but this is functionally equivalent to what we had.

This is still wants a nice admin back-end;
currently the way to manage photos is simply managing JPGs

This also wants a few more tweaks in the front-end,
solving some CSS problems and adding album pagination

See #13

This includes restructuring misc document templates
and properly slugifying document names