code: function setProperty(key, value, successCallback, errorCallback) {
          return neon.util.ajaxUtils.doPost(
              neon.serviceUrl('propertyservice', key), {
                  data: value,
                  contentType: 'text/plain',
                  success: successCallback,
                  error: errorCallback,
                  responseType: 'json'
              }
          );
      }
docs: Sets a property
  @method setProperty
  @param {String} the property key to set
  @param {String} the new value for the property
  @param {Function} successCallback The callback
  @param {Function} errorCallback The optional callback when an error occurs. This is a 3 parameter function that contains the xhr, a short error status and the full error message.
  @return {neon.util.AjaxRequest} The xhr request object