Support Network onStateChange callback.

js/examples/jquery/index.html

@@ -11,5 +11,6 @@
     <h1>jQuery example</h1>
     <button id="clicker">Click me</button>
     <div id="result">0</div>
+    <pre id="spy-holder"></pre>
   </body>
 </html>

js/examples/jquery/index.js

@@ -24,5 +24,8 @@ $(document).ready(function () {
 	}
       });
     });
+    G.network.onStateChange = function (mux, patch) {
+      $("#spy-holder").text(Syndicate.prettyTrie(mux.routingTable));
+    };
     G.startStepping();
 });

js/src/syndicate.js

@@ -36,6 +36,7 @@ function Network(bootFn) {
   this.processTable = Immutable.Map(); // pid -> Behavior
   this.runnablePids = Immutable.Set(); // of pid
   this.mux = new Mux.Mux();
+  this.onStateChange = function (mux, deltaAggregate) {};
   this.asChild('meta', function () { return bootFn() }, true);
 }
 
@@ -273,6 +274,7 @@ Network.prototype.deliverPatches = function (oldMux, updateStreamResult) {
     self.deliverEvent(pid, stateChange(patch));
   });
   events.metaEvents.forEach(Network.stateChange);
+  this.onStateChange(this.mux, updateStreamResult.deltaAggregate);
 };
 
 Network.prototype.deliverEvent = function (pid, event) {