v1.4.1: BugFix Busy-Wait

a stray "default:" case resulted in Sleep() turning into a busy wait.
This bugfix release removes this case.

v1.4: Pausing

• add the ability to pause/resume cron schedules via SIGUSR1
• fix intentionally-skipped tasks being erroneously re-tried

v1.3: Refactor

First release after being refactored into separately-tested components.

Includes a new -dump option for outputting a summary of the schedule in JSON format.

v1.2: verbose launch details

v1.2: verbose launch details

v1.1: multiple environment support

adding --prefix and --suffix, to support multiple versions/environments

v1.0: initial release

This is the initial release, containing only the most-basic
functionality: crontabs are parsed, and ECS Tasks are
launched