Merge branch 'develop' of https://github.com/LLNL/spack into features/custom_modulefile_from_config

.flake8

.style.yapf

.travis.yml

README.md

flake8.ini

lib/spack/docs/basic_usage.rst

lib/spack/spack/architecture.py

lib/spack/spack/config.py

lib/spack/spack/test/config.py

share/spack/qa/run-flake8

var/spack/repos/builtin/packages/ImageMagick/package.py

var/spack/repos/builtin/packages/Mitos/package.py

var/spack/repos/builtin/packages/astyle/package.py

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

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

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

...spack/repos/builtin/packages/py-logilab-common/package.py

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

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

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