Make JvmRun support passthru args.
Review Request #1696 - Created Jan. 31, 2015 and submitted
Also add comments to explain an unusual option registration pattern.
Built a jvm binary in a different repo, ran it with passthru args, verified that they were recognized.
CI passes: https://travis-ci.org/pantsbuild/pants/builds/48967731
Status: Closed (submitted)
Submitted as e08351e577d1cb5110b6df411f42e3a33cd689b5.