New Javadoc for #604

This is new Javadoc CSS.
The CSS has replacements done by Stefan Birkner in #604 and #832.
The javadoc is created with JDK > 1.5 and the Java code is checked against signatures of Java 5 API (see the sniffer-maven-plugin).
Made refactoring in pom.xml.
Fixed Java compiler warning in ParentRunner.