Added instrumentation
Added more tests to replicate the ConstraintViolationException. The tests were based on how the ModeShape customer is loading the repository with multiple threads. No luck yet replicating the problem.
Merge branch 'cigna-constraint-violation-error' of git://github.com/rhauch/modeshape into rhauch-cigna-ctr-violation-error

Conflicts:
	modeshape-jcr/src/test/java/org/modeshape/jcr/CignaTest.java
Updated test cases