GUI -- augmented hash parsing to include flags (after '?'), which are passed into view callbacks as a boolean map.
 - moved event test files into sub directories
 - prepared topo2.js for scenario choice via hash context and 'local' (and 'debug') flag.
 - added 'simple' scenario: 2 switches, 1 link, and 2 hosts.
 - augmented topo event dispatch for yet-to-be-implemented event handlers.
 - implemented addHost() event handler.

Change-Id: I06b032684fd4d5f85262d13d58ad10edae23b3ed
diff --git a/web/gui/src/main/webapp/json/ev/simple/scenario.json b/web/gui/src/main/webapp/json/ev/simple/scenario.json
new file mode 100644
index 0000000..d24626f
--- /dev/null
+++ b/web/gui/src/main/webapp/json/ev/simple/scenario.json
@@ -0,0 +1,9 @@
+{
+  "comments": [
+    "Add two devices and one link (auto), and two hosts."
+  ],
+  "title": "Simple Startup Scenario",
+  "params": {
+    "lastAuto": 0
+  }
+}
\ No newline at end of file