Merge branch 'remove-jabber-connection' into 'devel'

comment the connection to, and all event handlers related to this connection

See merge request !57

(cherry picked from commit 6feba383)

ef273025 delete jabber.rb and remove blather from gem dependencies
965edc16 [jabber] remove any mention to xmpp and jabber
4 jobs for cherry-pick-6feba383 in 16 minutes and 27 seconds (queued for 2 seconds)