add javassist to runtime classpath of org.jboss.tools.hibernate4_3
add getConfiguration() to HibernateExtension
add commented section to getParentClassLoader() and build() that hints as to how to execute things in the classloader of hibernate extension
add commented section showing how a hibernate version dependent configuration could be used
show a apologizing message when users try to expand the ConsoleConfiguration for Hibernate 4.3
slightly improve the unsupported message
add dependency on antlr for org.jboss.tools.hibernate4_3