Travis will ignore all specs tagged with :unfinished.
Tagged all Supervisor specs as :unfinished.
Tagged with :brittle all specs known to fail intermittently.
Refactored brittle Future test.
Tagged more specs with :brittle.
Refactored brittle Agent specs.
Refactored brittle timer and TimerTask specs.
Refactored brittle Exchanger spec.
Refactored brittle Agent 'as dereferenceable' specs.
Refactored brittle dereferenceable specs.
Better object cleanup in TimerTask spec.
Marked intermittently failing Actress as pending.
Marked several Actress specs pending because of intermittent JRuby failures.
Refactored brittle specs.
Removed tags from refactored specs.
Tagged brittle spec.
Returned several Actress specs that were previously pending.
Merge pull request #116 from ruby-concurrency/refactor/brittle-tests

Refactor brittle tests