Adding suspend, a generator-based control flow library.

Suspend is a generator-based control-flow for Node that is designed to play nice with callbacks, promises, and thunks.  It's available on npm as [suspend](https://www.npmjs.org/package/suspend), and the code is available on [GitHub](https://github.com/jmar777/suspend).
Merge pull request #137 from jmar777/patch-1

Adding suspend, a generator-based control flow library.