adding back decorator to force login, propagate topic_path to all landing page links
Merge remote-tracking branch 'jamalex/IDOC_coach_reports' into IDOC_coach_reports
Merge remote-tracking branch 'rtibbles/IDOC_coach_reports' into IDOC_coach_reports
making topic tree API endpoint generic; making topic tree front-end script generic to share across pages
merge.  Add common navigation bar. Move x/y axes below.
small fix on navbar; adding topic_path to links
Basic timeline view working.
speed up table view.  generate some new thumbnails.
reverting back tooltip
removing extraneous font that's ignored on chrome
switching around order of landing page plots
Scale y-axis by number of exercises for attempts and pct mastery.