public Page<User> getPagedAll(Role role, Pageable pageable) {
		return (role == null) ? userRepository.findAll(pageable) : userRepository.findAllByRole(role, pageable);
	}
get the user list by the given role.

@param role     role
@param pageable sort
@return found user list
ngrinder-controller/src/main/java/org/ngrinder/user/service/UserService.java