Remove 'safe' from templates.
Merge pull request #81 from akatsoulas/monkey-patch-jingo

Remove 'safe' from templates.
Add reveal.js lib.
Admin replies to questions functionality.

* Add reply form only for admins.
* Show replies in replied questions.
* Add datamigration for "Admin" group.
* Add reply field in questions.
Do not use underscore in classes.
Show only archived events in archive.