Port Google client enhancements to standalone RTT client.
Fix bug where bunched-up messages could cause a time ordering violation in
the RTT event queue.

--HG--
extra : source : bd0c92a99c872ca753cd2c3a3322e7b055b29fef
Implement action queue backlog monitoring.
This ensures that RTT is never than 1000 ms behind, even if
multiple stanzas are bunched up due to network congestion or
unreliability.
Bump version numbers for Trophy.js 0.2 and XEP-0301 draft standard 1.0.
Clean up for v0.2 release.
Add change log.