* Add tox.ini, setup.cfg and setup.py to allow docs building
using tox and setuptools
* Set doc/build as an output dir in setup.cfg to allow doc
publishing by gate-fuel-docs-docs job
* Add '.tox' and '*egg' paths to exclude_patterns in conf.py
* Add stub index.rst with basic info and link to the web verstion
of the docs to fix building of manpages
* Add '.tox' dir to .gitignore
Change-Id: Iaec750d6035bd0e30c10a12142be35514df1fb15