basic mesh node example app

src/Sprocket.h

@@ -17,11 +17,12 @@ class Sprocket {
     private:
         AppStack* stack;
         Scheduler scheduler;
-        Network* network;
+        Network network;
     public:
         Sprocket();
         Sprocket* init(SprocketConfig);
         Sprocket* join(Network&);
+        Sprocket* join(Network&, App&);
         Sprocket* use(AppStack*);
         Sprocket* addTask(Task&);
         Sprocket* app(App&);