Merge branch 'develop' of ssh://cz-stash.llnl.gov:7999/scale/spack into develop

lib/spack/llnl/util/filesystem.py

lib/spack/llnl/util/tty/__init__.py

lib/spack/llnl/util/tty/color.py

lib/spack/llnl/util/tty/log.py

lib/spack/spack/build_environment.py

lib/spack/spack/cmd/edit.py

lib/spack/spack/cmd/find.py

lib/spack/spack/cmd/install.py

lib/spack/spack/cmd/location.py

lib/spack/spack/directory_layout.py

lib/spack/spack/error.py

lib/spack/spack/fetch_strategy.py

lib/spack/spack/package.py

lib/spack/spack/test/__init__.py

lib/spack/spack/test/make_executable.py

lib/spack/spack/util/environment.py

lib/spack/spack/util/executable.py

var/spack/packages/py-cython/package.py

var/spack/packages/py-dateutil/package.py

var/spack/packages/py-genders/package.py