Lander

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- New plugin framework to customize how Lander retrieves metadata from LaTeX documents, and their Git repositories and CI/build environments.
You can create a new plugin by creating a package that registers a subclass of ``lander.ext.parser.Parser`` with the ``lander.parser`` setuptools entry point.

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- Update Jinja to >=2.10.1 to address CVE-2019-10906.
- Update asset build pipeline to Gulp 4 and update all other npm dependencies at the same time.

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- Update to ``lsst-projectmeta-kit`` to 0.3.5 for better author parsing.
- Update ``requests`` to 2.20.0 (security).

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- Lander will now cleanly abort when building on Travis CI, but the secure environment variables are not available.
This happens if the build is triggered by a fork.
- Switched to use ``$TRAVIS_BUILD_WEB_URL`` to get a URL to the build.
This is better than computing the build URL during the travis-ci.org to travis-ci.com transition.
- Updated test dependencies to pytest 4.2.1.
- Switched to ``setuptools_scm`` for version string management.

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- Update to lsst-projectmeta-kit 0.3.3 for improved detection of ``\input`` and ``\include`` commands in TeX source.

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- Update to ``lsst-projectmeta-kit`` 0.3.1 for more reliable ``metadata.jsonld`` generation (works around pandoc issues converting some documents to plain text).
There's a new integration test ``make dmtn070`` that demos this.
- Improve the testing strategy:
- Run ``make pytest`` to run pytest with the correct arguments instead of using ``--add-opts`` in setup.cfg. This lets us run ``pytest`` directly with ad hoc arguments.
- Run ``make test`` to run both pytest and the integration tests.