Eulexistdb

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* New filters and operators supported on :class:`eulexistdb.query.QuerySet`:
* ``exists`` - filter on the presence of absence of a node
* comparison operators ``gt``, ``gte``, ``lt``, ``lte``
* Support for excluding documents using all existing filters
with new method :meth:`eulexistdb.query.QuerySet.exclude`.

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* Support for restricting xqueries to a single document in
:class:`eulexistdb.query.QuerySet` with ``document_path`` filter.

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* Development requirements can now be installed as an optional requirement
of the eulexistdb package (``pip install "eulexistdb[dev]"``).
* Unit tests have been updated to use :mod:`nose`
* Provides a nose plugin to set up and tear down an eXist database collection
for tests, as an alternative to the custom test runners.

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* Update to latest released version of :mod:`eulxml` (0.18.0) with
backwards-incompatible DateField/DateTimeField change.

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* Support Python 2.7.
* Rearrange test code to support easier recombination.

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* Split out existdb-specific components from :mod:`eulcore`; now
depends on :mod:`eulxml`.