Support more APScheduler job-types

[fake-name]

Basically, right now, when you import ndscheduler, it installs it's own logging global handler.

If you're using ndscheduler in a context where you have existing logging infrastructure, this is extremely annoying, because it means you wind up either having to manually remove the logger after import, or you get double-logging of all log output.

Anyways, this PR just turns off the logging built-into the library. If you want logging, use logging.basicConfig() or similar.

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In general, a library should never install a global logging handler on import.

[fake-name]

Ok, it now also adds supports for:

• pypy psycopg2cffi (which is a drop-in replacement).
• Showing (and triggering, though not scheduling) interval-based jobs.

[fake-name]

Rolled up to current master.

Any chance of this getting merged?