Added a warning message if the min workers is greater than the max

This adds a helpful log message that will warn when the
configuration's min workers is greater than the max workers. This
won't cause any problems with DatTCP, but is most likely a
configuration mistake.

Closes #12
Merge pull request #15 from redding/jcr-warn-bad-workers-config

Added a warning message if the min workers is greater than the max