This patch set:
(a) renamed the docs folder to doc
(b) add in a basic tox.ini to generate the doc via ``tox -edocs``
(c) add in necessary /docs/requirements.txt dependencies
Change-Id: Id45db34fdc8860047047a4e6069483dfb4a56d7f
Signed-off-by: Tin Lam <tin@irrational.io>