the 'changed' property will now include any computed properties that were affected by the property being set

Enyo-DCO-1.1-Signed-off-by: Cole Davis <cole.davis@lge.com>
Merge pull request #468 from enyojs/ENYO-3124-cole-davis

Fix for ENYO-3124

Reviewed-By: Ben Combee (ben.combee@lge.com)