- aspnet/Mvc#2082
- problems specific to local `node` and related installations
- quote authenticode verification target
- quote local `node` library paths
- quote local `npm.cmd` path (with ye olde `/S` double-quoting hack)
- quote `--prefix` values in `npm install` commands
- quote `rimraf` directories to delete
- allows calling .shade files to avoid repeated `TestCommand()` calls
nit in _node-install.shade:
- name `default nodeDir` variable to match other shade files; reusing value