Correct missing command in loopback test adaptor

dist/loopback.js

@@ -35,6 +35,10 @@
       return Logger.info("Disconnecting from adaptor '" + this.name + "'...");
     };
 
+    Loopback.prototype.commands = function() {
+      return ['ping'];
+    };
+
     return Loopback;
 
   })();

examples/multiple.coffee

@@ -7,6 +7,10 @@ bots = [
 ]
 
 class ChattyRobot
+  connection:
+    name: 'loopback'
+    adaptor: 'loopback'
+
   work: (me) ->
     every 1.seconds(), ->
       Logger.info me.name

src/loopback.coffee

@@ -23,3 +23,6 @@ class Loopback
 
   disconnect: ->
     Logger.info "Disconnecting from adaptor '#{@name}'..."
+
+  commands: ->
+    ['ping']