code: function normalizeOptions(options, include) {
              _.forEach(options, function (v,k) {
                  if(!_.contains(include, k))
                      delete options[k];
              });
              return options;
          }
docs: Normalize options including only required.
  @memberof Helpers
  @param {object} options - the options object.
  @param {array} include - an array of keys to include.
  @returns {object}