javafx-gradle-plugin 1.2

New:

• added workaround for issue #12 regarding file descriptor leak inside the JDK starting from 1.8.0_60

As there seems to be no good way for having something like maven-invoker-plugin (which is used for the javafx-maven-plugin), I still need to find a nice way having buildable example-projects.

If there are some cool ways to have something similar like maven-invoker-plugin but for gradle, please contact me with working examples.