Added aurora to man nodes

mac.json

@@ -56,6 +56,13 @@
                 "platform": "MAC",
                 "maxInstances": 1,
                 "seleniumProtocol": "WebDriver"
+	    }, {
+                "browserName": "firefox",
+                "version": "aurora",
+                "firefox_binary": "/Applications/FirefoxAurora.app/Contents/MacOS/firefox-bin",
+                "platform": "MAC",
+                "maxInstances": 1,
+                "seleniumProtocol": "WebDriver"
             }
         ],
     "configuration": {}