tree aa8129c3092c5d2c5a1254f56c34bed954556ebb
parent 0c28457e5da084259ff3ed86cdc0bb76f5646a72
author Avery Pennarun <apenwarr@gmail.com> 1357284994 -0500
committer Avery Pennarun <apenwarr@gmail.com> 1357285564 -0500

Change enqueue()/runqueue() to avoid global variables.

Also, change enqueued functions to call done() callbacks instead of using
return values, so that async functions (like http requests) can be used as
steps.

Add some unit tests for enqueue/runqueue.