breaking change: All results now come in JSON API schema

- see examples of JSON API schema: http://jsonapi.org
- badges.rb: returns cadet information in JSON API schema
  - get_badges return hash with :username and :badges
	- :badges is an array of hashes {badge:<String>, date:<Date>}
- academy.rb: returns cadets information in JSON API schema
	- get_dates returns hash of {'cadets' => <Array>}
  - each element of <Array> is a hash from get_badges
- spec/badges_test.rb: tests for 'Get badges for one user' pass
	- changed actual badge results to cadet_actual
  - now selects correct badge each time for comparison
  - 'Get badges from multiple users' commented out for now