Automated merge with http://waqas.ath.cx:8000/

util.stanza: Serializer optimizations, and nicer output for empty elements

mod_pep: Broadcast only to available recipients with caps

mod_pep: Ignore presence subscriptions when extractng hash information

mod_pep: Added function get_caps_hash_from_presence

util.muc: Fixed duplicate parameter names in function room:set_subject

util.muc: Fixed incorrect parameters for a function call

mod_pep: Removed some YODO comments

mod_pep: Added handler for disco responses

mod_message: Advertise offline message support as per XEP-0160 (thanks nolan)

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