pipy upload for 0.1.8

There seems to be a 0.1.8 release (at least there is a tag for it), but no upload to pypy (see https://pypi.python.org/pypi/castra). Is there a reason for this or just forgotten?

Start by checking the 0.1.8 tag and the castra package listing on PyPI. Determine whether the tagged release has publishable artifacts and whether this repository still has an active release process; the issue is done only when the 0.1.8 package is available on PyPI or the reason it cannot be published is documented.

Written by the indexing model from the issue text.