jme3-utilities-ui v0.9.6 and jme3-utilities-x 0.3.0

• Targeted Java v8.
• Targeted version 3.5.0-stable of jMonkeyEngine.
• Based on version 7.2.0 of the Heart Library.

jme3-utilities-ui v0.9.6:

• Added the AbstractDemo class, a subclass of ActionApplication.

jme3-utilities-x v0.3.0:

• Moved the Population class to the Heart Library.
• Created a distinct logger for the Shell3f class.