Initial draft structure

Hey, all. @cmcavoy @kayaelle @threeqube Take a look at what we have going here: 

http://ottonomy.github.io/openbadges-specification (may take 10min to generate)
http://ottonomy.github.io/openbadges-specification/1.0/context.json
http://ottonomy.github.io/openbadges-specification/1.0/schema/badgeclass.json

It's really rough around the edges!