Added Rake task to update desktop users to new_ui

lib/tasks/desktop_update.rake

@@ -0,0 +1,11 @@
+namespace :desktop_update do
+  task :update_users => :environment do
+     @desktop_user = User.all
+     @desktop_user.each do |u|
+        desk = u.desktop 
+         desk.theme = DesktopTheme.first.id.to_s
+         desk.wallpaper = nil
+         desk.save!
+     end
+  end
+end