Deb-pkg-tools

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

- Added command line interface for static checks (with improved test coverage).
- Made ``collect_related_packages()`` a bit faster.
- "Refine" entry collection strategy for Travis CI.

.. _Release 1.27: https://github.com/xolox/python-deb-pkg-tools/compare/1.26.4...1.27

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

Restore Python 3.x compatibility (`failing build
<https://travis-ci.org/xolox/python-deb-pkg-tools/jobs/33995580>`_).

.. _Release 1.26.4: https://github.com/xolox/python-deb-pkg-tools/compare/1.26.3...1.26.4

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

Still not enough entropy on Travis CI, let's see if we can work around that...

I tried to fix this using ``rng-tools`` in 3c372c3097f_ but that didn't work
out due to the way OpenVZ works. This commit introduces a more general approach
that will hopefully work on OpenVZ and other virtualized environments, we'll
see...

.. _Release 1.26.3: https://github.com/xolox/python-deb-pkg-tools/compare/1.26.2...1.26.3
.. _3c372c3097f: https://github.com/xolox/python-deb-pkg-tools/commit/3c372c3097f

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

- Restore Python 3 compatibility.
- Improve test coverage.
- Try to work around lack of entropy on Travis CI.

.. _Release 1.26.2: https://github.com/xolox/python-deb-pkg-tools/compare/1.26...1.26.2

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

Add static analysis to detect version conflicts.

.. _Release 1.26: https://github.com/xolox/python-deb-pkg-tools/compare/1.25...1.26

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

Make ``collect_related_packages()`` 5x faster:

- Use high performance decorator to memoize overrides of ``Relationship.matches()``.
- Exclude conflicting packages from all further processing as soon as they are found.
- Moved the dpkg comparison cache around.
- Removed ``Version.__hash__()``.

.. _Release 1.25: https://github.com/xolox/python-deb-pkg-tools/compare/1.24.1...1.25