Log Message:
Import lukko-0.1.1.1

This package provides access to platform dependent file locking APIs:

* Open file descriptor locking on Linux (Lukko.OFD)

* flock locking on unix platforms (Lukko.FLock)

* Windows locking LockFileEx (Lukko.Windows)

* No-op locking, which throws exceptions (Lukko.NoOp)

Lukko module exports the best option for the target platform with
uniform API.