fixed bug:

   when the (tls enabled) xmpp connection was reset by the server
   peer, the close-event would be missed.

caused by: missing the call 'SignalClosed()' from XmppSocket::OnCloseEvent()
Merge branch 'xlive' of https://github.com/RichardLuo/droid.external.libjingle.talk into xlive
1. commented the assert:
  // ASSERT(!element->HasAttr(QN_FROM));
  since the new class XmppServer needs QN_FROM

2. added lots of log, should del latter
fixed a crash-bug: process will crash while release tasks.

caused by:
       the dependences of tasks and it's parent, parent task must
       be release latter than the child-task since the child-task contains
       reference to it's parent-task.

fixed by: changed the release order of tasks, make sure the
parent-tasks are released latter than it's child-tasks