Use the z.jar files on the zinc classpath if they exist

Review Request #3955 — Created May 30, 2016 and discarded — Latest diff uploaded

zundel
pants
zundel/compile-with-zjars
3529
pants-reviews
benjyw, gmalmquist, nhoward_tw, stuhood

Added feature to use the z.jar files on the zinc classpath if they exist.

This decreases the compile time of our biggest target from 6m30s to 1m24s.

Ran this through our CI builder and tested locally. Dramatic compile time improvements all around.

CI is green at https://travis-ci.org/pantsbuild/pants/builds/134164353

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