On requiring pytorch-qrnn

[guillaume-chevalier]

Shouldn't the repo pytorch-qrnn be a submodule in the current awd-lstm-lm repo, and add an instruction in the README.md in the current awd-lstm-lm repo to do a git clone using --recurse-submodules ?

Or perhaps the current repo could include a requirements.txt which could be used to install automatically the pytorch-qrnn?

Just suggesting a few things to simplify setting things up :)