Moved detail panel trail tracking from DOM to currentTrail variable
Removed check for source match between trail and trailhead.
Bugfix to fix detail panel reveal/hide.
Added fixDuplicateTrailNames(), refactored out makeTrailheadPopups().
Slight simplification of detail panel code.
For #56: clicks on trailnames now update detail panel.
Fixes #57. Diff trailheads, same trail, don't close detail panel.
Added leaflet-usermarker for glowy blue location dot. #11.
Merge branch 'master' into old-map-new-style
Merge branch 'master' into old-map-new-style