Update sanitizer rules.
Allow empty author of a blogpost.
Add setting to determine the ``author`` of the ``Posts`` imported.

The ``email`` is used to determine who the owner
of the post is.
Fix failing test for the ``consumer`` component.
Run the ``blog_import`` command as part of the dummy fixtures.
Clean up ``Post`` content.
Display imported ``blog`` content.
Store HTML generated content in the ``html`` fields.