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