v1.0.7  Enable for all 1.8.x versions; add fix for 1.8.6 patchlevels < 31

  v1.0.6  Try again for 1.8.5.

  v1.0.5  Backwards compatibility tweak for 1.8.5

  v1.0.4  Fix for JRuby, and re-enable fastthread for 1.8.6p111

  v1.0.3. Make native build a noop on Rubies that have no real need for fastthread

  v1.0.2. Merged stale wait entries fixes from ruby_1_8, fixed SizedQueue#enq

  v1.0.1. Signed gem.