[Toybox] yash - a posix-compliant shell

[scsijon]

https://github.com/magicant/yash

Came across his while perusing various linux's bookmarks (trying to 
re-find a package i'd lost it's name, just knew i'd know it when I saw 
it). Just wondering what you thought of it and is it worth considering 
adding in to toybox as it's suppose to be posix-compliant, although 
claiming to be the most posix-compliant shell in the world I'm not sure 
about.

regards

scsijon