telepathy-account-widgets: update submodule
configure.ac: disable tp-aw's GSettings

This is needed to avoid multiple components shipping the same schema.
It's just a temporary workaround that won't be needed when
https://bugzilla.gnome.org/show_bug.cgi?id=706317 will be fixed.

https://bugzilla.gnome.org/show_bug.cgi?id=706803
telepathy: initialise the default Tp features in the Tp provider

By initialising the default Telepathy features in the provider (so in
libgoabackend) instead of in the daemon, we can rely on those features
in every place where we use Telepathy.

Ideally we should add a function to do this in tp-aw, but for now this
is enough. See <https://bugzilla.gnome.org/show_bug.cgi?id=706892>.

https://bugzilla.gnome.org/show_bug.cgi?id=706894
telepathy: we need the TpAccount's connection by default

https://bugzilla.gnome.org/show_bug.cgi?id=706894
telepathy: initialise the features we need by default for TpConnection

https://bugzilla.gnome.org/show_bug.cgi?id=706894