Lookup node in PATHs

I installed to `c:\nodejs` to avoid spaces in path (old habits die hard). So i had an obstacle you see.
This actually needs to stay here, and the paths should be reversed. Some people on Atom have both the 64-bit and 32-bit versions of node.js installed (since most people hacking on normal web apps want 64-bit). We want to:

1. Try the official 32-bit path on 64-bit OS (`Program Files (x86)`)
1. Try the official 32-bit path on 32-bit OS (`Program Files`)
1. Can't think of anything else, run down `PATH` and hope for the best