[REFACTOR] Remove unnecessary require
[TEST] User::checkIfEmailIsUnique
[TEST] User#getSafeValues()
[TEST] User#hashPasswordAndSave()
[REFACTOR] Make User#toJSON() format in Ember compatible mode by default
[TEST] User#toJSON() creates Ember compatible object
[TEST] User#toJSON() allowing the disabling of namespacing
[TEST] User#toJSON() does not contain password
[BUG] Fix model names in model index
[TEST] Refactor: rename 'params'
[TEST] User#toJSON() contains label id or null
[TEST] User#toJSON() sideloads labels