Display who added commercial for event

Activate versioning for tests

The tests were failing because of the lack of versioning.By default, versioning is off for tests.
As a result, here (app/views/proposal/_form.html.haml L43) commercial,versions.last returns nil as there are no versions.

app/helpers/application_helper.rb

@@ -383,7 +383,7 @@ module ApplicationHelper
       reverse.sub(',', ' dna ').reverse
   end
 
-  def change_creator_link(user_id)
+  def link_to_user(user_id)
     user = User.find_by(id: user_id)
     if user
       link_to user.name, admin_user_path(id: user_id)
@@ -479,16 +479,16 @@ module ApplicationHelper
 
   def user_change_description(version)
     if version.event == 'create'
-     change_creator_link(version.item_id) + ' signed up'
+     link_to_user(version.item_id) + ' signed up'
     elsif version.event == 'update'
       if version.changeset.keys.include?('reset_password_sent_at')
         'Someone requested password reset of'
       elsif version.changeset.keys.include?('confirmed_at') && version.changeset['confirmed_at'][0].nil?
-        (version.whodunnit.nil? ? change_creator_link(version.item_id) : change_creator_link(version.whodunnit)) + ' confirmed account of'
+        (version.whodunnit.nil? ? link_to_user(version.item_id) : link_to_user(version.whodunnit)) + ' confirmed account of'
       elsif version.changeset.keys.include?('confirmed_at') && version.changeset['confirmed_at'][1].nil?
-        change_creator_link(version.whodunnit) + ' unconfirmed account of'
+        link_to_user(version.whodunnit) + ' unconfirmed account of'
       else
-        change_creator_link(version.whodunnit) + " updated #{updated_attributes(version)} of"
+        link_to_user(version.whodunnit) + " updated #{updated_attributes(version)} of"
       end
     end
   end

app/views/admin/events/show.html.haml

@@ -21,7 +21,7 @@
                   = version.id
                 %td
                   %p
-                    = change_creator_link(version.whodunnit)
+                    = link_to_user(version.whodunnit)
 
                     - if version.item_type == 'Event'
                       = event_change_description(version)

app/views/admin/versions/index.html.haml

@@ -17,7 +17,7 @@
           = version.id
         %td.col-md-9
           %p
-            = change_creator_link(version.whodunnit) unless version.item_type == 'User'
+            = link_to_user(version.whodunnit) unless version.item_type == 'User'
 
             - case version.item_type
             - when 'Event'

app/views/proposal/_form.html.haml

@@ -40,3 +40,6 @@
                         - if can? :destroy, commercial
                           = link_to 'Delete', conference_program_proposal_commercial_path(@conference.short_title, @event.id, commercial.id),
                           :method => :delete, :data => { :confirm => 'Are you sure?' }, class: 'btn btn-danger'
+                    .text-right
+                      = "added by "
+                      = link_to_user(commercial.versions.last.whodunnit)