Eulxml

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* Fixed an error in eulxml.xpath parse that resulted in parse errors
when other lexers are defined.

---------------------------

* :class:`eulxml.xmlmap.XmlObject` now supports lazy-loading for XSD
Schemas. To take advantage of this feature,
:class:`~eulxml.xmlmap.XmlObject` subclasses should define an
``XSD_SCHEMA`` location but should not set an ``xmlschema``.
* When :ref:`field <xmlmap-field>` mapped on a
:class:`eulxml.xmlmap.XmlObject` is deleted, any XPath predicates
that could have been automatically constructed when setting the
value will be deleted from the :class:`~eulxml.xmlmap.XmlObject`
where possible, if they are otherwise empty.

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* Add basic support for `MODS <http://www.loc.gov/standards/mods/>`_ in
:mod:`eulxml.xmlmap.mods`.
* Add basic support for `PREMIS <http://www.loc.gov/standards/premis/>`_ in
:mod:`eulxml.xmlmap.premis`.
* Minor logging and error handling improvements.

--------------------------

* Downgrade the lack of an HTTP_PROXY set in the environment from a
RuntimeError to a Warning with schema validation disabled.

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* Fixed an error in the dependency structure that prevented the package from
being used after installation through PyPI.

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* Fixed an error in the dependency structure that prevented the package from
being installed through PyPI.