Minor fixes

Fix sword2 version, add ipython as a development dependency, and add a
common namespace map for use when working with METS and XML.  Update
existing lxml code to use it.
Create AtoM entry for AIP

refs #6009

Create the AtoM entry with the title, ID, and description of the AIP.
Title and description parsed from the METS file Dublin Core title and
description.  Extract state IRI for polling LOCKSS-o-matic from the
deposit receipt.