ConcurrentRuby API documentation

Pick a concurrent-ruby version:

*master *1.3.8 with edge 0.7.2 *1.1.10 with edge 0.6.0 *1.1.9 with edge 0.6.0 *1.1.8 with edge 0.6.0 *1.1.7 with edge 0.6.0 *1.1.6 with edge 0.6.0 *1.1.5 with edge 0.5.0