The warning from sphinx should be print from the gh_pages_build task in a verbose mode otherwise is not possible to solve the problem.
---> github.tools.task.gh_pages_build
---> github.tools.task.gh_pages_clean
Update/reset "docs/_build/html" submodule
Create local gh-pages branch
Fetch any changes on the gh-pages remote branch
Checkout gh-pages branch
Remove docs/_build/html/reference.html
unlink docs/_build/html/reference.html
Remove docs/_build/html/searchindex.js
unlink docs/_build/html/searchindex.js
Remove docs/_build/html/modindex.html
unlink docs/_build/html/modindex.html
Remove docs/_build/html/.buildinfo
unlink docs/_build/html/.buildinfo
Remove docs/_build/html/sources
rmtree docs/_build/html/sources () {}
Remove docs/_build/html/genindex.html
unlink docs/_build/html/genindex.html
Remove docs/_build/html/images
rmtree docs/_build/html/images () {}
Remove docs/_build/html/installation.html
unlink docs/_build/html/installation.html
Remove docs/_build/html/controls.html
unlink docs/_build/html/controls.html
Remove docs/_build/html/search.html
unlink docs/_build/html/search.html
Remove docs/_build/html/visio.html
unlink docs/_build/html/visio.html
Remove docs/_build/html/objects.inv
unlink docs/_build/html/objects.inv
Remove docs/_build/html/gettingstarted.html
unlink docs/_build/html/gettingstarted.html
Remove docs/_build/html/screenshots.html
unlink docs/_build/html/screenshots.html
Remove docs/_build/html/manager.html
unlink docs/_build/html/manager.html
Remove docs/_build/html/static
rmtree docs/_build/html/static () {}
Remove docs/_build/html/index.html
unlink docs/_build/html/index.html
Remove docs/_build/html/changes.html
unlink docs/_build/html/changes.html
running egg_info
writing requirements to neuronvisio.egg-info/requires.txt
writing neuronvisio.egg-info/PKG-INFO
writing top-level names to neuronvisio.egg-info/top_level.txt
writing dependency_links to neuronvisio.egg-info/dependency_links.txt
writing entry points to neuronvisio.egg-info/entry_points.txt
reading manifest file 'neuronvisio.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no files found matching 'setup.cfg'
writing manifest file 'neuronvisio.egg-info/SOURCES.txt'
Built html doc from docs/ to docs/_build/html
sphinx-build -d docs/_build/doctrees -b html docs/ docs/_build/html
Running Sphinx v0.6.2
loading pickled environment... done
building [html]: targets for 9 source files that are out of date
updating environment: 0 added, 0 changed, 0 removed
looking for now-outdated files... none found
preparing documents... done
writing output... [100%] visio
writing additional files... genindex modindex search
copying images... images/plotting_variable.png images/neuronWithSpines.png images/pyramidal_3D_change_voltage.png images/pyramidal.png images/nrnvisio-user-color.png images/Simple_model.png images/spines_detailed_thumbnail.png images/init_and_run.png images/userInterface-0.3.png images/pylab_integration.png images/voltage_variation_among_time.png images/NeuronVisio_Controls_selecting_variable.png
copying static files... done
dumping search index... done
dumping object inventory... done
build succeeded, 1 warning.
paver only display the content of subprocess' stderr on failure...