t:rosie.ws: basic tests for Rosie web service.

Test ad-hoc web server start up.
Basic JSON API tests.

Remove ROSE_CONF_IGNORE environment variable. Functionality fulfilled by an
empty value of ROSE_CONF_PATH. ROSE_CONF_PATH will now override the default
setting instead of append to it.
t:rosie-ws: test on-site.
t:rosie-ws: tests with data.