add ffaker seed tasks
update readme with instructions for seeding db
some work on populating user_challenges, but no luck
fix user_challenge seed task
add queries for challenge index and show
edit readme
add rudimentary offscreen nav and root page hero
improve offscreen nav toggle
finish responsive nav with offscreen toggle on mobile
removed some comments from nav css
fix jquery ready function to work with turbolinks
Merge pull request #7 from marklc44/master

add ffaker seed tasks