migrate to Rails 4.0 (closes foodcoops#214)

Conflicts:
	Gemfile.lock

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

@@ -29,12 +29,12 @@
     .well
       %h4= t '.groupabos'
       %ul.unstyled
-        - for membership in Membership.find_all_by_user_id(@user.id)
+        - for membership in Membership.where(user: @user)
           %li= link_to(membership.group.name, [:admin, membership.group])
 
 %hr/
 %p
   = link_to t('ui.edit'), edit_admin_user_path(@user), class: 'btn'
-  = link_to t('ui.delete'), [:admin, @user], :confirm => t('.confirm', user: @user.first_name),
+  = link_to t('ui.delete'), [:admin, @user], :data => {:confirm => t('.confirm', user: @user.first_name)},
     :method => :delete, class: 'btn btn-danger'
   = link_to t('.send_message'), new_message_path(:message => {:mail_to => @user.id}), class: 'btn'