Do not apply sanitize function to project root folder name

This commit fix the error shown bellow.
```
% lein new luminus foo-bar
Generating a lovely new Luminus project named foo-bar...
Could not create directory  foo-bar . Maybe it already exists?
foo_bar/project.clj (No such file or directory)
```
Merge pull request #7 from cola-zero/do-not-sanitize-root-folder-name

Looks good thanks