Create Mode Status.groovy

 Nobody Home

Author: brian@bevey.org
 Date: 9/10/13
 
 Monitors a set of presence detectors and triggers a mode change when everyone has left.
 When everyone has left, sets mode to a new defined mode.
 When at least one person returns home, set the mode back to a new defined mode.
 When someone is home - or upon entering the home, their mode may change dependent on sunrise / sunset.