Download JAR files tagged by contriubutors with all dependencies

Usurped Modello plugin, generally depending on the existing plugin tree to work properly. This particular one adds 2 generators that produce reflection-based reading so that the lack of java getters doesn't break generation. Sorry if the original contriubutors list isn't generated. A given version of this code will be based on some version of modello with some additional 4th number like ".0" appended to the version.