[fix bug 1007077] Implement email backend for remo dev/stage.

* Use DatabaseEmailBackend to store emails in the database.
* Override this functionality for emails originating from SERVER_EMAIL
  and send them through SMTP to notify ADMINS.
[bug 1011411] Base commenting system for the voting app.
[bug 1011411] Email notification for the commenting system.
[fix bug 1011411] Make voting email notifications opt-in.
Merge pull request #762 from akatsoulas/1011411

[fix bug 1011411] Commenting system for the voting app.
Fix indentation in dashboard_reps template.
Merge pull request #779 from akatsoulas/fix-indentation

Fix indentation in dashboard_reps template.
[fix bug 1038598] Remove spaces from IDs in edit_event template.
Merge pull request #780 from akatsoulas/1038598

[fix bug 1038598] Remove spaces from IDs in edit_event template.
[fix bug 1034569] Add a check mark to the current polls that a user has voted.
Merge pull request #776 from johngian/1007077-fix-admin-emails

[fix bug 1007077] Implement email backend for remo dev/stage.
Merge pull request #778 from akatsoulas/1034569

[fix bug 1034569] Add a check mark to the current polls that a user has voted.