Add caps namespace to namespaces.h
XMPPMulticastDelegate: Iterate over a copy of the delegates array
XMPPDiscoEntity: Update JID on resource bind
XMPPContactManager: Indentation fixes
XMPPContactManager: Remove contact from store after broadcasting the selector
XMPPContactManager: Support for handling subscription requests
XMPPDiscoEntity: Caps hash must be Base64 encoded SHA1
Adjust to reworked exception API.