Expose types needed to specify jvm_binary.deploy_jar_rules.

This also fixes up the pydoc strings to get full BUILD dictionary
linkage from jvm_binary through jar_rules to Skip and Duplicate.

Testing Done:
$ ./build-support/bin/publish_docs.sh -opd jsirois

See here:
http://pantsbuild.github.io/jsirois/build_dictionary.html#jvm_binary
http://pantsbuild.github.io/jsirois/build_dictionary.html#bdict-jar-rules
http://pantsbuild.github.io/jsirois/build_dictionary.html#bdict-skip
http://pantsbuild.github.io/jsirois/build_dictionary.html#bdict-duplicate

Bugs closed: 383, 384

Reviewed at https://rbcommons.com/s/twitter/r/727/