permission errors solution added

Sometimes when you install a npm package with sudo, the ~/tmp dir will have the owner `root`. This is the reason when installing/updating docpad or any other npm package that uses temporary files, results in permission errors.
alter system files removed

I think it' rather dangerous to change the user of system files and make them writable.
Revert "alter system files removed"

This reverts commit a59abda9975aacc9437e1c23327b71f666cca2eb.
typo fix
Merge pull request #98 from robkorv/patch-1

permission-errors