Replaced bcrypt with SHA-512
Made Groups API REST available on global admin router
Added authz tests for getting/updating group members on the global admin
Tweak documentation for hashing/comparing passwords
Merge branch 'bcrypt-to-sha512'

* bcrypt-to-sha512:
  Tweak documentation for hashing/comparing passwords
  Replaced bcrypt with SHA-512
Merge branch 'master' of https://github.com/fronteerio/grasshopper