Set thread execution information for VisualVM inspection
Fix internal pool. Ensuure that all access is thread-safe. Eliminate O(n) counts and array traversals in favor of O(1) push/pop and scalar counters
Handle cases where the current actor is nil
Merge pull request #448 from cheald/named_threads

Set thread execution information for VisualVM inspection
Merge pull request #449 from cheald/fix_internal_pool

Internal pool fixes
Update CHANGES
Allow failures on Ruby 1.9.3