Merge pull request googollee#254 from chappjc/clean-disconnect

conn: On Close, leave all rooms, and call the disconnect handler

conn.go

@@ -84,6 +84,13 @@ func newConn(c engineio.Conn, handlers map[string]*namespaceHandler, broadcast B
 func (c *conn) Close() error {
 	var err error
 	c.closeOnce.Do(func() {
+		// For each namespace, leave all rooms, and call the disconnect handler.
+		for ns, nc := range c.namespaces {
+			nc.LeaveAll()
+			if nh := c.handlers[ns]; nh != nil {
+				nh.onDisconnect(nc, "bye")
+			}
+		}
 		err = c.Conn.Close()
 		close(c.quitChan)
 	})