Compilable, runnable jar

These changes allow a user to:

    git clone https://github.com/FauxFaux/recordloader.git . && \
    mvn package && \
    java -jar target/record*encies.jar

.. without having to fiddle with settings or classpaths.  The resultant JAR is much easier to use than the one referenced in [the tutorial].

[the tutorial]: <http://marklogic.github.com/recordloader/tutorial.html>