Fix missing capabilities.h and caps-channel-manager.h
Fix missing capabilities.h and caps-channel-manager.h

The problem was introduced by this commit:

|commit 587da15932d178ad289e81b039dcabb4e90984c5
|Author: Jonny Lamb <jonny.lamb@collabora.co.uk>
|Date:   Thu Sep 1 14:19:52 2011 +0100
|
|    gabble: add capabilities.h and caps-channel-manager.h as public API
|
|    Signed-off-by: Jonny Lamb <jonny.lamb@collabora.co.uk>

Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,mlundblad/telepathy-gabble,mlundblad/telepathy-gabble,mlundblad/telepathy-gabble