Maven support

This creates a local maven file repo in the ./maven-repo directory and "installs" the submodules to it. The script is more assuming than I would like and using a local file repo isn't optimal, but it works.

Would you consider putting ioutils and lzmajio on the maven central repository? It would require updating the versions for both of them (ioutils doesn't even have one yet, lzmajio's is from 2009 I believe). If so, it might be a good idea to give lzmajio a distinct group Id, as it's a fork.