Duplicated javassist lib in test classpath

The test classpath has the following duplicate entries:

• javassist-3.9.0.GA.jar coming from:

  org.hibernate:hibernate-entitymanager:jar:3.4.0.GA:test
  \- javassist:javassist:jar:3.9.0.GA:test
  

• javassist-3.6.ga.jar coming from:

  org.concordion:concordion:jar:1.3.0:test
  \- jboss:javassist:jar:3.6.ga:test
  

We need to exclude jboss:javassist from the org.concordion dependency.