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

db/migrate/20160627122446_create_surveys.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CreateSurveys < ActiveRecord::Migration
   def change
     create_table :surveys do |t|

db/migrate/20160628093634_create_survey_questions.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CreateSurveyQuestions < ActiveRecord::Migration
   def change
     create_table :survey_questions do |t|

db/migrate/20160629145954_add_target_to_surveys.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddTargetToSurveys < ActiveRecord::Migration
   def change
     add_column :surveys, :target, :integer, default: 0

db/migrate/20160630094850_create_survey_replies.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CreateSurveyReplies < ActiveRecord::Migration
   def change
     create_table :survey_replies do |t|

db/migrate/20160630130731_create_survey_submissions.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CreateSurveySubmissions < ActiveRecord::Migration
   def change
     create_table :survey_submissions do |t|