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
the main motivator was the issue when people ran `pip install deis` and have the v0.11.0 of the client and the server is running v0.12.0-dev, which caused a version mismatch error. I've fixed that now.