Factor implementation

[bjourne]

Are you interested in adding a Factor (http://factorcode.org/) implementation for the benchmark? I wrote one here: https://github.com/bjourne/playground-factor/blob/master/lpath/lpath.factor

[logicchains]

That would be great! I was originally planning to add one but then I found the language seemed like it would take me quite a while to learn, as I don't have any experience with concatenation programming. Feel free to submit a pull request.