- Bumped Modeshape Version to 3.7.1.Final
- added dependency management for commons-lang 2.5
- added dependency management for asm 3.2
changed expected exception to java.jcr.AccessDeniedException, since this is returned by mode 3.7.1 instead of a java.security.AccessControlException
added ExceptionMapper for AccessDeniedException
fixes uncaught AccessDeniedException when detailing jcr:content nodes, newly thrown by modeshape 3.7.1
plus a typo fix

Resolves: https://www.pivotaltracker.com/story/show/64183776 , and
          https://www.pivotaltracker.com/story/show/63415884