adding SpEL lock key expressions on the @Synchronized annotation, so that you can derive a lock key from a complex method argument, like Spring's @Cacheable annotation.
supporting custom lock key expressions for derived lock keys, in the synchronizer aop advice.
raising the minor version number for the new, backward compatible support for derived lock keys via custom SpEL expressions on @Synchronized annotations
Merge branch 'dev'
documenting the new derived lock key expressions