Fix .json endpoint on facia fronts
Use LinkedHashSet instead to keep order
Fix trails.json endpoint to take trails from first collection that is not empty
Remove template deduping creation from facia controller
Back to HashSet for now
Clean imports
Add chart to show results of Facebook most read A/B test
Replace guardian witness logo by text
Use variable for spacing
Merge pull request #1728 from guardian/witness-fixes

Replace guardian witness logo by text
Merge pull request #1723 from guardian/kc-fb-pop-test-results

Add chart to show results of Facebook Most Read A/B test
Does not really need to be a var
Merge branch 'facia-trails-json'
Merge remote-tracking branch 'origin/master'
Merge remote-tracking branch 'origin/master' into icons

Conflicts:
	common/app/assets/images/global/sprite.png
	common/app/assets/stylesheets/theme/_global-icons-sprite.scss