code: function getUserRoles() {
      return [
        {name: 'User', role: 'user', settable: true},
        {name: 'Admin', role: 'admin', settable: true},
        {name: 'Root', role: 'root', settable: false}
      ];
    }
docs: @ngdoc function
  @name getUserRoles
  @methodOf auth.service:Auth
  @description
  Get the array of all user roles
  
  @returns {Array} Each role has this format `{name: String, role: String, settable: boolean}`