Fix basic style issues with rubocop

db/migrate/20121223122842_create_venue_table.rb

@@ -15,5 +15,4 @@ class CreateVenueTable < ActiveRecord::Migration
   def down
     drop_table :venues
   end
-
 end

db/migrate/20130113105652_create_email_table.rb

@@ -12,7 +12,6 @@ class CreateEmailTable < ActiveRecord::Migration
       t.text :confirmed_email_template
       t.timestamps
     end
-
   end
 
   def down

db/migrate/20130515125823_change_attachment_default.rb

@@ -2,6 +2,7 @@ class ChangeAttachmentDefault < ActiveRecord::Migration
   def up
     change_column_default(:event_attachments, :public, true)
   end
+
   def down
     change_column_default(:event_attachments, :public, nil)
   end

db/migrate/20131229072532_registrations_vchoices.rb

@@ -1,6 +1,6 @@
 class RegistrationsVchoices < ActiveRecord::Migration
   def up
-      create_table :registrations_vchoices, :id => false do |t|
+    create_table :registrations_vchoices, :id => false do |t|
       t.references :registration, :vchoice
     end
   end

db/migrate/20140610163947_create_event_users.rb

@@ -30,6 +30,5 @@ class CreateEventUsers < ActiveRecord::Migration
       record.comment = ep.comment
       record.save!
     end
-
   end
 end

db/migrate/20140701123203_add_events_per_week_to_conference.rb

@@ -65,10 +65,9 @@ class AddEventsPerWeekToConference < ActiveRecord::Migration
       conference.save
     end
 
-
     # Cumulate the previous weeks to get a snapshot
     TempConference.all.each do |conference|
-      hash = conference.events_per_week.sort.to_h
+      hash = conference.events_per_week.sort.to_hash
       previous = nil
 
       hash.each do |week, values|