Breaking change: Changed return	of badges to include name of cadet

badges.rb:
  - get_badges method returns a hash of hash
academy.rb:
  - reduce returned array of hashes into a merged hash of hashes
  - change array variable names to be more intuitive
spec/badges_test.rb:
  - create before block for 'Get badges for one user' to get correct user
  - renamed variable names into cadet_found and cadets_found