Workaround Chrome EventSource bug.
Workaround Chrome EventSource bug.

* Chrome doesn't always fire an error event when an event source is closed,
  which can lead to the client thinking it has a connection when really it's
  already closed.
* Now resyncs ready state on each tick (every 60s), so will discover and
  reconnect.

linagora/overture,adityab/overture,linagora/overture,Hokua/overture,fastmail/overture