[Telepathy] merge: telepathy-sofiasip

[Merge Monkey]

Merge to:

  telepathy-sofiasip

From:

  /home/zabaluev/public_html/darcs/telepathy-sofiasip-untangle-session-termination

Changes:

  Mikhail Zabaluev <mikhail.zabaluev at nokia.com>
    Remove an unnecessary runtime check that should have been an assertion

  Mikhail Zabaluev <mikhail.zabaluev at nokia.com>
    Don't log the channel pointer which is normally NULL at the call termination event

  Mikhail Zabaluev <mikhail.zabaluev at nokia.com>
    eliminated the "terminated" signal on SIPMediaSession; the callback code for SIPMediaChannel moved to priv_destroy_session(), which is the new name for priv_release_session()

  Mikhail Zabaluev <mikhail.zabaluev at nokia.com>
    Assertion to verify that the session is terminated when closing a media channel