Merge pull request #383 from LLNL/features/better-executable-args

lib/spack/spack/cmd/bootstrap.py

lib/spack/spack/cmd/create.py

lib/spack/spack/cmd/pkg.py

lib/spack/spack/compiler.py

lib/spack/spack/fetch_strategy.py

lib/spack/spack/test/cc.py

lib/spack/spack/test/make_executable.py

lib/spack/spack/test/mock_repo.py

lib/spack/spack/test/svn_fetch.py

lib/spack/spack/util/executable.py

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