Add topics.loaded event to be triggered when new topics are loaded by infinite scroll.
closes #2409
Merge pull request #2410 from joe1chen/add-topics-loaded-event

Add topics.loaded event to be triggered when new topics are loaded by infinite scroll.
closes #2400
closes #2377
check err
closes #2390
removed webserver.init
Merge remote-tracking branch 'origin/master' into disney