Fix memory leaks

Author: ry

lib/net.js

@@ -629,6 +629,9 @@ Socket.prototype.connect = function() {
   initSocket(self);
   if (self.fd) throw new Error('Socket already opened');
 
+  assert(!self._readWatcher);
+  assert(!self._writeWatcher);
+
   timers.active(this);
 
   self._connecting = true; // set false in doConnect

src/node_io_watcher.cc

@@ -84,6 +84,9 @@ static Handle<Value> IOAlloc(const Arguments& args) {
 static Handle<Value> IOFree(const Arguments& args) {
   HandleScope scope;
   ev_io *io = JSToAddress<ev_io>(args[0]);
+  Persistent<Object>* obj_p = static_cast<Persistent<Object>*>(io->data);
+  obj_p->Dispose();
+  delete obj_p;
   delete io;
   return Undefined();
 }