move foodsoft_wiki db migration to plugin

config/application.rb

@@ -63,5 +63,8 @@ module Foodsoft
     # It would be nice not to enable database connection when precompiling assets,
     # but i18n-js requires initialization, that's why it's on.
     config.assets.initialize_on_precompile = true
+
+    # Include engine migrations. - http://stackoverflow.com/a/8364459/2866660
+    config.paths['db/migrate'] += Rails.application.railties.engines.map{|e| e.paths['db/migrate'].existent}.flatten
   end
 end