fix docs generation

docs/conf.py

@@ -120,7 +120,7 @@ html_theme = 'default'
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
-html_static_path = ['_static']
+#html_static_path = ['_static']
 
 # If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
 # using the given strftime format.

tox.ini

@@ -97,4 +97,4 @@ basepython = python2.7
 changedir = docs
 deps = sphinx
 commands =
-    sphinx-build -W -b html -d {envtmpdir}/doctrees . {envtmpdir}/html
+    {envbindir}/sphinx-build -W -b html -d {envtmpdir}/doctrees . {envtmpdir}/html