Refs #50 - First stab at pytest plugin for running healthchecks. Include entry point.
Refs #50 - Use the add_marker() api instead of mucking about in pytest internals.
Ref #50 - Documentation for py.test. Better implementation for `--healthcheck` switch.
Move tests directory out of hospital package.
Fix flake8 failures.
Psycho-rebased branch 50-support-pytest on top of master. Refs #50.
Refs #50 - Introduced test around pytest integration.
Refs #50 - Asserted pytest with -m 'not healthckeck' does not select healthchecks.
Refs #50 - Pytest items are healthchecks if either function or class is healthcheck (was only function).
Refs #50 - Using absolute imports.
Refs #50 - Removed pytest --healthcheck option: duplicate of '-m healthcheck'.
Refs #50 - Updated CHANGELOG.
Refs #50 - Updated AUTHORS.
Restoring some tests around healthcheck loading.
Pytest can collect and run healthchecks. Closes #50.