David Baker 4d46251b15 Just use the keepalive logic to recover from lost internet connections. ...

* This should fix the problem where we could end up with two concurrent syncs
   due to both retrying /sync and hitting /versions. There is now one and only
   one mechanism for connection recovery.
 * Hit /versions a little less often as I think every 2 seconds is a little
   over-aggressive. Also introduce randomness to minimize possibility of
   thundering herds.
 * Add a listener for the 'online' event in case any browser is nice enough
   to ever fire it.
 * Treat a 400 response from /versions as successful since older synapses
   will not support it.

2016-02-09 16:08:14 +00:00

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