To add downstream tests to be run in CI:
1. Create a test handler for the downstream consumer that you want to test.
* The test handler should be a single file in the ``.travis/downstream.d/`` directory.
* The file name should be ``{downstream name}.sh`` where ``{downstream name}``
is the name that you wish to use to identify the consumer.
* The test handler should accept a single argument that can be either ``install`` or ``run``.
These should be used to separate installation of the downstream consumer and
any dependencies from the actual running of the tests.
2. Add an entry to the test matrix in ``.travis.yml`` that sets the ``DOWNSTREAM``
environment variable to the downstream name that you selected.
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