GUI -- Added updateDevice event handling.
 - Display offline devices as grey.
 - Tracing web socket messages (for now, in console; in future, to trace view).
 - Captured sample events for use with test scenarios - both from and to the server.
 - Added description to scenario file.

Change-Id: I7825b32d63496ebea2ab5789519fb0c6af6c5257
diff --git a/web/gui/src/main/webapp/json/ev/_capture/rx/updateDevice_ex2.json b/web/gui/src/main/webapp/json/ev/_capture/rx/updateDevice_ex2.json
new file mode 100644
index 0000000..d607f98
--- /dev/null
+++ b/web/gui/src/main/webapp/json/ev/_capture/rx/updateDevice_ex2.json
@@ -0,0 +1,15 @@
+{
+  "event": "updateDevice",
+  "payload": {
+    "id": "of:0000000000000002",
+    "type": "switch",
+    "online": false,
+    "labels": [
+      "of:0000000000000002",
+      "2",
+      "",
+      null
+    ],
+    "props": {}
+  }
+}