fixed build error on windows 7 with java 8.

In maven build and in eclipse kepler, JSObject was resolved from
lib/ext/jfxrt.jar instead of lib/plugin.jar (alphabetical order issue?)
"mvn clean install" should now work in peers-js, but you still may have
to configure eclipse manually: Window > Preferences > Java >
Installed JREs
select jre8, Edit, select lib/ext/jfxrt.jar and Remove.
rebuild peers-js project and it should work.