function unlinkFromGlobal (cwd, name) {
	const dst = path.join(cwd, 'node_modules', name)
	return unlink(dst)
}
revert the effects of `ied link some-package` by removing the previously
created symbolic links from the project's `node_modules` directory (used for
`ied unlink some-package`).
@param {String} cwd - current working directory.
@param {String} name - name of the dependency to be unlinked from the
project's `node_modules`.
@return {Observable} - observable sequence.