Apologies, I didn't mean uninstall the whole nodejs, but only the ionic-quickstarter (because of the changes I made).
Anyway, yes with nodejs 0.12 it's known to work. But since I now include the new/updated gulp-sass version (which is supposed to be backwards compatible with the old nodejs and with the new nodejs), it SHOULD work with both v.0.12 or with the new v.4.
At least that's the theory, which works, as far as I could test it.
If you're still interested then just delete the whole quickstarter, do a fresh install, run the commands "npm install" (which should install gulp-sass) and so on, and then if it doesn't work, well then I also don't know, I'm giving up then because this takes too much time ... then we just wait till Ionic 2 comes out. 