Hackathon changes on 07/19/2014

Add function  getPropertiesValueOrDefault() in the GUIproperties.java file,
Rework and fix function getPropertiesValueAsList() in the GUIproperties.java file,
Unit test GUIproperties.java and GUIHierarchyConcatenationProperties.java file.
This file should have a name and/or comments that identify what test(s) use it and how it is being used.