Another small fix, for logging in s2smanager

Mmm, s2s fixed :)

Merge from waqas

Added error replies for unhandled stanzas

Added basic offline message support

Added util.datetime: Utility methods to support XEP-0082: XMPP Date and Time Profiles

Added support for storing (and removing), loading and appending to lists of data to datamanager (for supporting offline messages)

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mercurial