Native Packaging WIX

[Will Hoover]

AFIK, in order to use JavaFX packaging with WIX you have to first add the
path to the WIX binaries to the PATH environment variable (or have the
binaries in the user.dir for which the ant build is being ran). I don't
suppose we could get an additional attribute added to fx:deploy so we can do
this:

<fx:deploy basedir="/path/to/wix"/>

Similar to how version 8 will have:

<fx:platform basedir="/path/to/jdk"/>