Add support for incremental optimistic locking

This feature is fully described here: http://community.jboss.org/wiki/IncrementalOptimisticLocking
This together with lock reordering[1] cover 100% of the possible deadlock situations in the optimistic locking scheme[2].

[1] http://community.jboss.org/wiki/LockReorderingForAvoidingDeadlocks
[2] http://community.jboss.org/wiki/OptimisticLockingInInfinispan