Fixes #6
Removed old css
Fixed facebook icon size in itineraries show
[ci skip]
Updated gems
Fixed invalid date error in new itinerary preview
Using standard localization in itinerary preview
Updated navbar to reflect latest facebook navbar changes
Added a presence validator on return date field of round trip itineraries
Bumped VERSION to 0.6.16
Updated CHANGELOG
Merge branch 'release/0.6.16' into develop