docs: def pull(self, cartname=None, env=None):
          """
          `cartname` - Name of cart
  
          Pull remote cart from the pre release (base) environment
          """
          if not env:
              env = self._defaults['start_in']
          juicer.utils.Log.log_debug("Initializing pulling cart: %s ...", cartname)
  
          cart_file = os.path.join(juicer.common.Cart.CART_LOCATION, cartname)
          cart_file += '.json'
  
          cart_check = juicer.utils.download_cart(cartname, env)
          if cart_check is None:
              print 'error: cart \'%s\' does not exist' % cartname
              return None
          else:
              juicer.utils.write_json_document(cart_file, juicer.utils.download_cart(cartname, env))
              return cart_check