Update to avoid misunderstanding. `--with-perl` means building Perl modules (PL/Perl) instead of perl runtime, `--with-python` means building Python modules (PL/Python) instead of python runtime.

- This is a placeholder Concourse CI pipeline and task. See concourse.ci
  for details on the Concourse system.

Move the Vagrant instructions to /vagrant and add a note to that in the main README.md file.

version for Python module

In the long run, we should get rid of that dependency by rewriting the
code that currently uses 'ed', but meanwhile this should be documented.

Sujeet Varakhedi