JSON API

- Users Controller (index, show)
- Orgs Controller (index)
- Rack::Cors gem to allow cross site scripting
- ActiveModel::Serializer for better JSON serialization
  (http://robots.thoughtbot.com/better-serialization-less-as-json)
- Link to the JSON API Docs at kata-docs.simian.us
Org Serializers

- Add org_ids to the user serializer
- Add the Org subclass serializers