Bluebird has this built in. For a quick userscript where I needed something similar, I created this which works ( warning: no unit tests, but it works for me )
Bluebird has a `Promise.each` which does this. Also, you can use `thenable chaining` - make an initial promise and then chain it on each iteration - it becomes very similar to a for loop. I can add an example if you'd like.
