Fix token rules text when gen_time is less than 1 min.

Fixes #143.
Change the --light behavior of ContestExporter/Importer

Avoid it skipping testcases, and rename it to --no-generated as it's a
better description.
Small improvements to cms.io
Small improvements to a couple of services
Update ParameterTypes

Add default values and a way to get a JSON description.
Add Watcher
Start rewriting AWS