fix design index bug when start start from blank DB.

add delay impressionist.
add several i18n vars

lib/tasks/site.rake

@@ -23,6 +23,9 @@ namespace :site do
 
     # home_trans = I18nVariable.create!( :document_class => 'Home', :key => 'home', :en => 'Homepage', :zh_tw => '首頁')
     design = Design.first
+    site = Site.first
+    site.design = design
+    site.save
     theme = design.themes.first
     home = Page.new(  :design_id => design.id, :name => 'home', :is_published => true, :theme_id => theme.id )