concurrent-ruby:
* Documentation for Event and Semaphore
* Use Unsafe#fullFence and #loadFence directly since the shortcuts were removed in JRuby
* Do not depend on org.jruby.util.unsafe.UnsafeHolder
concurrent-ruby-edge:
* (#620) Actors on Pool raise an error
* (#624) Delayed promises did not interact correctly with flatting
* Fix arguments yielded by callback methods
* Overridable default executor in promises factory methods
* Asking actor to terminate will always resolve to `true`