Work around to fix #28.

There is an open issue (https://github.com/celluloid/celluloid-io/pull/23) in Celluloid for over two years and it is related with issue #28. @halorgium wrote a fix but it never got merged.

This commit is adding this fix as a 'monkey patch'. I know that it is not the best way to solve it but...

I asked to @wengzilla to test it and he reported me that it is working fine.

If you don't want to wait until @zerowidth merges it you can download my own gem.

```shell
gem uninstall -x -a ringleader
curl -O https://dl.dropboxusercontent.com/u/242526/ringleader-1.1.7.issue28.gem
gem install ringleader-1.1.7.issue28.gem
````