Patch Set 8: I would prefer that you didn't submit this

I think this is ready to submit.  But we shouldn't store binary object files:

  $ file org.eclipse.jgit.macosx_x86_64/native/libjgitnative.jnilib
  org.eclipse.jgit.macosx_x86_64/native/libjgitnative.jnilib: Mach-O 64-bit dynamically linked shared library x86_64

The build should be integrated into the master Maven build, and we should also support Linux x86 and x86_64 builds, but we can address those with follow-up commits.