Updated trail segments steward_id and osm_tags field names (issues #34 & #58)
Preparing steward info upload (issue #58)
Completed stewards.csv generation (issue #58)
Tweaked steward form
Completed test for uploaded steward data (closes #58)
Added happy-making success messages in validation output
Expanded sample dataset display to three columns
initial layout for validator message pages
merged master
very minor style fixes after merge