Version bump? 1.3.2 or 1.4.0?

[boboudreau]

@CyrilMazur introduced a rad new feature to include environment variables in each worker, but the 1.3.1 release was set in May 2015, and your pull in June never bumped the version number.

I'd include dev-master, but am wary of any other future merges that may break things or new features that you include in a v2 version that breaks dependencies. Just a thought. Will probably fork and include a cloned version until I hear back. Hope you consider it!