[NFC] Add display name for custom React components

This improves readability of "Components" tab from React Development Tools extension for Chrome

client/homebrew/brewRenderer/brewRenderer.jsx

@@ -17,6 +17,7 @@ const PAGE_HEIGHT = 1056;
 const PPR_THRESHOLD = 50;
 
 const BrewRenderer = createClass({
+	displayName : 'BrewRenderer',
 	getDefaultProps : function() {
 		return {
 			text     : '',

client/homebrew/brewRenderer/errorBar/errorBar.jsx

@@ -5,6 +5,7 @@ const _     = require('lodash');
 const cx    = require('classnames');
 
 const ErrorBar = createClass({
+	displayName : 'ErrorBar',
 	getDefaultProps : function() {
 		return {
 			errors : []

client/homebrew/brewRenderer/notificationPopup/notificationPopup.jsx

@@ -7,6 +7,7 @@ const cx    = require('classnames');	//Unused variable
 const DISMISS_KEY = 'dismiss_notification09-9-21';
 
 const NotificationPopup = createClass({
+	displayName : 'NotificationPopup',
 	getInitialState : function() {
 		return {
 			notifications : {}