docs(get-deis): update provision info

The comments were being wrapped due to our current CSS rules in our
code blocks, so I removed them. I also updated the documentation to
use the latest tagged release instead of pulling from master, as that
will prove to be more reliable as an example.

fixes deis/deis#1896
Ok. We still say:
> Until there is a stable release, we recommend you check out the latest "master" branch code and refer to the latest documentation. 
in [README.md](README.md), but I guess we can leave that as-is until after the next-next- release.