apycot #2035100 Use XMPP/Jabber to communicate changes in hg repos instead of pulling [open]

Pull hg repos can be tedious, pushing is not always possible (fw rules), so jabber could be a nice way to communicate that a hg repo has changed and that narval should check updated and run tests.

Inspiration can be taken from http://www.mayrhofer.eu.org/dvcs-autosync (dropbox like in open source) that uses a single jabber account with multiple connections to tell other servers to pull hg or git... jabberbot inside http://thp.io/2007/python-jabberbot/ (unfortunately the code for dvcs-autosync doesn't look very clean)

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