Add more options for surveys

* Survey period constraints
* Add abilities
* Enforce required questions
* Update survey_submssion updated_at
* Do a full match of possible answer and user reply

app/views/admin/events/_datatable_row.haml

@@ -61,3 +61,8 @@
       = link_to "#{event.comments_count}",
         admin_conference_program_event_path(conference_id, event),
         anchor: 'comments-div'
+    %td.text-center
+      = link_to new_admin_conference_survey_path(@conference.short_title,
+        survey: {  surveyable_type: 'Event', surveyable_id: event.id }),
+        class: 'btn btn-success' do
+        .fa.fa-plus