[Telepathy] merge: telepathy-sofiasip

[Merge Monkey]

Merge to:

  telepathy-sofiasip

From:

  /home/zabaluev/public_html/darcs/telepathy-sofiasip-dtmf

Changes:

  Mikhail Zabaluev <mikhail.zabaluev at nokia.com>
    Stubbed out the Channel.Interface.DTMF implementation

  Mikhail Zabaluev <mikhail.zabaluev at nokia.com>
    Changed signatures on session telephony event methods to raise errors

  Mikhail Zabaluev <mikhail.zabaluev at nokia.com>
    Changed the DTMF parameter type to guchar as per spec version 0.15.2

  Mikhail Zabaluev <mikhail.zabaluev at nokia.com>
    Implemented emission of telephony event signals

  Mikhail Zabaluev <mikhail.zabaluev at nokia.com>
    Stubbed out telephony event methods on media stream

  Mikhail Zabaluev <mikhail.zabaluev at nokia.com>
    Stubbed out telephony event methods on the session, implemented the channel's DTMF interface with these