Port RC-support to TOML

README.rst

conda/meta.yaml

doc/api.rst

doc/click.rst

doc/conf.py

doc/example_defaults.py

doc/index.rst

doc/links.rst

doc/rc.rst

expose/click.py

expose/rc.py

setup.py

tests/data/oldjson.cfg

tests/data/userdefaults_ex1.cfg

tests/test_config.py

tests/test_logging.py

tests/test_rc.py