Using a "single-thread pool"  to queue XMPP messages
Using a "single-thread pool"  to queue XMPP messages

This ensures that sleekxmpp is called from a single thread when sending messages.
It should avoid the state machine exceptions that appear in some cases (bad connections, etc).

librallu/cohorte-herald,ahmadshahwan/cohorte-herald,isandlaTech/cohorte-herald,gattazr/cohorte-herald,librallu/cohorte-herald,librallu/cohorte-herald,ahmadshahwan/cohorte-herald,ahmadshahwan/cohorte-herald,isandlaTech/cohorte-herald,gattazr/cohorte-herald,isandlaTech/cohorte-herald,gattazr/cohorte-herald