Merge pull request #1563 from adamjstewart/features/sphinx

var/spack/repos/builtin/packages/py-alabaster/package.py

var/spack/repos/builtin/packages/py-babel/package.py

var/spack/repos/builtin/packages/py-docutils/package.py

var/spack/repos/builtin/packages/py-imagesize/package.py

var/spack/repos/builtin/packages/py-jinja2/package.py

var/spack/repos/builtin/packages/py-markupsafe/package.py

var/spack/repos/builtin/packages/py-pygments/package.py

var/spack/repos/builtin/packages/py-pytz/package.py

var/spack/repos/builtin/packages/py-setuptools/package.py

var/spack/repos/builtin/packages/py-six/package.py

...pack/repos/builtin/packages/py-snowballstemmer/package.py

...ack/repos/builtin/packages/py-sphinx-rtd-theme/package.py

var/spack/repos/builtin/packages/py-sphinx/package.py