Working version. Added quartize to work as CRON on heroku.
Read job start time from `JOB_START_TIME` env var.

The delimiter is `:` (e.g. 7:30:15).
Makes sure heroku doesn't hiccup when compiling.

`JOB_START_TIME` is not set at compile time so Heroku was throwing an exception
trying to `split` a `nil`.
Make sure we're passing ints to `time-of-day`.
Convert `PORT` value to int for jetty.
Switched to CRON expression for scheduling.
Refactoring.

* Introduced `:shared` profile to facilitate common properties handling.
* Added `trammel` (design-by-contract lib) to ensure env vars are set.
* Various minor improvements.
Minor renaming.