docs: def active_version():
      """
      Determine the current active version on the server
      
      Just examine the which environment is symlinked
      """
      
      link = '/'.join([deployment_root(),'env',env.project_name])
      if not exists(link): return None
      active = os.path.split(run('ls -al '+link).split(' -> ')[1])[1]
      return active