java 9 fix, message me if this breaks java8 builds

Signed-off-by: Kai Boernert <kai-boernert@visiongamestudios.de>
Merge branch 'master' of https://github.com/empirephoenix/JME3-JFX

Conflicts:
	src/main/java/com/jme3x/jfx/JmeFxContainer.java

Signed-off-by: Kai Boernert <kai-boernert@visiongamestudios.de>