code: function save(datastore, kind, namespace) {
      return function(data, cb) {
          var keyParam = [kind, data.id];
          if (namespace) {
              keyParam = {
                  namespace: namespace,
                  path: keyParam
              };
          }
          var key = datastore.key(keyParam);
          datastore.save({key: key, data: data}, cb);
      };
  }
docs: Given a datastore reference and a kind, will return a function that will save an entity.
  The object must have an id property
  
  @param {Object} datastore A reference to the datastore Object
  @param {String} kind The entity kind
  @returns {Function} The save function