[ci] Move into a flat structure to facilitate testing

MANIFEST.in

exposed/__init__.py

exposed/click.py

exposed/config.py

exposed/logging.py

exposed/rc.py

exposed/tests/__init__.py

exposed/tests/conftest.py

exposed/tests/data/__init__.py

exposed/tests/data/basic_config.py

exposed/tests/data/complex.py

exposed/tests/data/oldjson.cfg

exposed/tests/data/second_config.py

exposed/tests/data/test_dump_config.py

exposed/tests/data/test_dump_config2.py

exposed/tests/data/userdefaults_ex1.cfg

exposed/tests/data/verbose_config.py

exposed/tests/test_click.py

exposed/tests/test_config.py

exposed/tests/test_logging.py