trailhead amenity icons now showing, tooltips on all icons, empty fields and their headers now removed
fixing some broke styles for icons on mobile
Merge branch 'stylez'
small change to limit about section size, add scroll on mobile
updated copy for default trail and trailhead on load
fixed trailhead name and trailhead distance on mobile (except default trail bug)
merged master, resolved conflicts
commit before merging mobile-detail-panel branch
Merge branch 'mobile-detail-panel'

"merging mobile-detail-panel, changes to slide drawer, icons, sundy other improvements...default trail bug on mobile not fixed"
Merge branch 'master' into stylez

Conflicts:
	js/trailhead.js