docs: def bootstrap(options):
      """create virtualenv in ./bootstrap"""
      try:
          import virtualenv
      except ImportError, e:
          raise RuntimeError("virtualenv is needed for bootstrap")
  
      bdir = options.bootstrap_dir
      if not os.path.exists(bdir):
          os.makedirs(bdir)
      bscript = "boostrap.py"
  
      options.virtualenv.script_name = os.path.join(options.bootstrap_dir,
                                                    bscript)
      options.virtualenv.no_site_packages = True
      options.bootstrap.no_site_packages = True
      print options.virtualenv.script_name
      call_task('paver.virtual.bootstrap')
      sh('cd %s; %s %s' % (bdir, sys.executable, bscript))