transformed into maven project, for easier building and testing

Hi,

I've transformed this project into an Apache Maven based one.
Thus, the source file structure follows well known standards.
And unit tests can be started automatically in continues integration systems (via mvn test).
I thought, the support for Java 1.6 is sufficient.
Additionally I took the liberty of adding README and LICENSE files,
which makes advances to people browsing on github.com.

Feedback is welcome.

Regards
Martin