Addresses #150. Null activity values no longer match filters. Needs testing with real data.
trying out orange trail markers
moved old icons, made the active icon bigger
typo
deleted prepopulated text for photo caption
Merge branch 'mobile-detail-panel' into stylez
typo in js
Merge branch 'stylez'
typo in logo
Merge remote-tracking branch 'origin' into nullFilterFix
Merge branch 'master' into stylez
added full about page content / styles for mobile
Merge branch 'stylez'
Merge branch 'mobile-detail-panel' into stylez

Conflicts:
	js/trailhead.js

used alan's api host (line 37 of trailhead.js)
fixed bathroom icons name
Merge branch 'stylez'
alignment/spacing on desktop detail panel
Merge branch 'master' into stylez
Merge branch 'stylez'
merged master, resolved conflicts