add docs config

requirements.txt

+alabaster==0.7.7
+Babel==2.3.3
+cookies==2.2.1
+coverage==4.0.3
+docutils==0.12
+flake8==2.5.4
+funcsigs==1.0.0
+imagesize==0.7.0
+Jinja2==2.8
+linecache2==1.0.0
+MarkupSafe==0.23
+mccabe==0.4.0
+mock==2.0.0
+ordereddict==1.1
+pbr==1.8.1
+pep8==1.7.0
+pockets==0.3
+pyflakes==1.0.0
+Pygments==2.1.3
+pytz==2016.3
+requests==2.9.1
+responses==0.5.1
+six==1.10.0
+snowballstemmer==1.2.1
+Sphinx==1.4.1
+sphinx-rtd-theme==0.1.9
+sphinxcontrib-napoleon==0.5.0
+traceback2==1.4.0
+unittest2==1.1.0