[Telepathy] merge: telepathy-spec

[Merge Monkey]

Merge to:

  telepathy-spec

From:

  /home/smcv/public_html/darcs/telepathy-spec-smcv

Changes:

  Simon McVittie <simon.mcvittie at collabora.co.uk>
    Channel: specify the invariant that there can be no more than one named channel per (channel type, handle type, handle)

  Simon McVittie <simon.mcvittie at collabora.co.uk>
    Try again to specify Renaming, following much discussion.
This time, channels that have a handle do not follow the rename (clients are
responsible for migrating to a new channel), and groups are specified to emit
MembersChanged after the Renamed signal.

  Simon McVittie <simon.mcvittie at collabora.co.uk>
    Specify that channel-specific handles and general-purpose handles must be disjoint sets

  Simon McVittie <simon.mcvittie at collabora.co.uk>
    Renaming: don't imply that the channel necessarily goes away when its contact has been renamed away