Revert "prune: --production option to unbuild devDependencies"

This reverts commit f65da7d7f156fd28db10042a8db6682ef70178a7.

See #4509
rimraf@2.2.6
read-package-json@1.1.6
adduser: All defaults are empty strings if unfound
v1.3.24
Merge branch 'master' of github.com:npm/npm