Prefers set-immediate due to changes in Node.

Node's new version doesn't allow recursive process.nextTick

> process.nextTick happens at the end of the current tick, immediately after
> the current stack unwinds. If you are currently using recursive nextTick
> calls, use setImmediate instead.

See <https://github.com/joyent/node/wiki/Api-changes-between-v0.8-and-v0.10>
Bumps to 0.1.3