Merge pull request #356 from glogiotatidis/ignore-vendor-dirty

Ignore vendor dirty git modules.
Merge pull request #362 from akatsoulas/847457

[fix bug 847457] Add/Edit Voting.
Merge pull request #361 from johngian/845295

[Fix bug 845295] Fix custom date range query date variation
[Fix bug 842306] Initial implementation of comments in events

* Add EventComment model and EventCommentForm
* Implement comment in events/views.py
* Add delete event comment to URLs
* Add delete comment permissions
* Fixes in CSS
* Send email to event owner on comment
* Add settings for email on comment
* Add tests