Changes in packaging required for RHEL 7.

- RHEL 7 uses 'tomcat' not 'tomcat6'
- RHEL 7 needs asm and cglib explicitly
- Require apache-mime4j equal to 0.6.
  The location of the Message class changed between 0.6 and 0.7 in
  apache-mime4j.  We have to use the 0.6 version or RESTEasy will throw
  ClassNotFoundExceptions.