Support for multiple plattforms at the same time

Hi,

currently development on our local machines is a bit of a hassle, since we have developers use all kind of OSses, e.g Linux, macOSX and even Windows. So looking at the latest build refinements in J2V8 - would it be possible to provide a maven artifact, which contains all the lib files for all supported platforms? From what I can tell the lib loader _should_ be able to handle that.

In hindsight it would also be nice to have a "core" image, which does not contain any lib whatsoever, and instead relies on the platform to provide one (#252).