Add tests data in source distribution
Update pypy status on README

Tests fails because it appears __del__ is not called when del doc
is invoked. But the conversion work.
pylokit: Use classes as context manager

This fixes stale lock files on pypy where __del__ was not called
immediately after a del myobject leading to tests failure.
This change the API but we should be around 0 users right now.
Plus it makes the code more beautiful.

Fixes #3
Update README

Update examples to match latest API nad not we are fine on pypy
Bump version to 0.8.0