Create binary package for the release.

Until now we had just one source package as a release artifact. I propose to create a binary artifact as well as usually this is what a user is looking for. The binary artifact would contain:

• A readme to explain that it's a library
• the compiled jars
• licence/notice/disclaimer files as ususal
• the scripts to execute the example servers. Currently it works with the arithmetic example but it could be extended with the filestore example.

I think to provide a binary package with a simple startup script to demonstrate the behavior of the library, could help to the users to try it out even without coding.