Configure Windows settings for JavaFX Gradle plugin

These settings have been copied from the plugin's "FullyExpressed"
sample build. Certain items have been left unmodified and simply
commented out.

At this point, the build works, in that it creates a .msi installer,
but the Bitsquare executable that is installed ultimately fails to run
with a "missing MSVCP100.dll" error. After some (unsuccessful) efforts
to work around this issue, I've created the following issue with the
JavaFX Gradle plugin:

https://bitbucket.org/shemnon/javafx-gradle/issue/43

See #66