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.
All files need to have the license and disclaimer statement:
/*
 * (C) Copyright 2014 Java Test Automation Framework Contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */