Update JavaDocs

The JavaDocs at http://junit.sourceforge.net/javadoc/index.html are for JUnit 4.0. Also, the getting started page ( http://junit.sourceforge.net/ ) links to the 4.0 JavaDocs ( http://junit.sourceforge.net/javadoc_40/index.html ).

It'd be helpful to get these updated to the current version (4.4 at the time I write this).