Merge branch 'develop' of https://github.com/LLNL/spack into qa/coding_standard

README.md

etc/spack/modules.yaml

lib/spack/docs/basic_usage.rst

lib/spack/env/cc

lib/spack/llnl/util/filesystem.py

lib/spack/llnl/util/lang.py

lib/spack/spack/__init__.py

lib/spack/spack/build_environment.py

lib/spack/spack/cmd/info.py

lib/spack/spack/cmd/module.py

lib/spack/spack/cmd/pkg.py

lib/spack/spack/cmd/stage.py

lib/spack/spack/cmd/uninstall.py

lib/spack/spack/concretize.py

lib/spack/spack/config.py

lib/spack/spack/fetch_strategy.py

lib/spack/spack/modules.py

lib/spack/spack/package.py

lib/spack/spack/stage.py

lib/spack/spack/test/__init__.py