code: function (deviceManifestIdentifier, feedIdentifier, data) {
        var path,
            rejectMsg;
        if (deviceManifestIdentifier && feedIdentifier && data) {
          path = this.constructPath(constants.DEVICE_MANIFESTS, deviceManifestIdentifier,
                                    constants.FEEDS, feedIdentifier);
          return this.Core.PATCH(path, data);
        } else {
          rejectMsg = 'Bad Request: A device manifest identifier, a feed identifier and a data object are required.';
          return this.rejectRequest(rejectMsg);
        }
      }
docs: Update a feed on a device manifest
  @param  {String|Integer} deviceManifestIdentifier A Robin device manifest identifier
  @param  {String|Integer} feedIdentifier           A Robin feed identifier
  @param  {Object}         data                     A querystring object
  @return {Function}                                A Promise