the threaded http server now runs on localhost:8000

  * ThreadedServer is not serving admin media when the admin django app is installed
  * ThreadedServer is now really trying to bind with higher TCP ports when the default is busy
  * the "harvest" command now shows a error when a given path does not exist

Fixed the section "Use the latest code to contribute with lettuce’s codebase" on the docs, in the page "Installing Lettuce"