GitLab

Fixes issue #199

Fires after all stream features have been processed.

Also, add detection of legacy XMPP version.

NOTE: XEP-0313 is still very experimental, and there will likely be
      API changes in the future.

This style of handler is necessary for capturing result sets from
queries that use multiple messages to send the results instead of
in a single result stanza. Notably, XEP-0313 (MAM).

timedelta.seconds does not store the total seconds of a time span.
Internally, seconds is the next smaller unit to days, hence
timedelta.seconds will never exceed (or reach) the number of seconds
in a day (60*60*24=86400)