message: Show the error dialog when requests to PUT power levels fail
  This is why I dislike Q.
diff: @@ -376,6 +376,7 @@ module.exports = WithMatrixClient(React.createClass({
  // get out of sync if we force setState here!
  console.log("Power change success");
  }, function(err) {
  + var ErrorDialog = sdk.getComponent("dialogs.ErrorDialog");
  Modal.createDialog(ErrorDialog, {
  title: "Failure to change power level",
  description: err.message
  