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

.mailmap

.travis.yml

README.md

bin/sbang

bin/spack

lib/spack/docs/basic_usage.rst

lib/spack/docs/developer_guide.rst

lib/spack/docs/features.rst

lib/spack/docs/getting_started.rst

lib/spack/docs/index.rst

lib/spack/docs/mirrors.rst

lib/spack/docs/packaging_guide.rst

lib/spack/docs/site_configuration.rst

lib/spack/env/cc

lib/spack/env/nag/nagfor

lib/spack/env/pgi/case-insensitive/pgCC

lib/spack/env/pgi/pgc++

lib/spack/env/pgi/pgfortran

lib/spack/llnl/util/filesystem.py

lib/spack/llnl/util/lang.py