braindump for windows

this isn't meant as a solution, but as a place to experiment with window support (as time permits)

symlinks apparently work if:

- [x] the user is an admin (confirm)
- [x] the users policy allows them (couldn't get this to work)
- [ ] get feedback from @joliss 

with more hacks i was able to get ^^ sorta booting, but I ran into other problems (like missing files) and I failed to have time to investigate further today
This whole thing seems super-brittle... I think we should just return true if !isWindows, so at least we don't incur the brittleness on Mac/Linux.

I suspect [__dirname](http://nodejs.org/docs/latest/api/globals.html#globals_dirname) might not always be writable, e.g. if the currently executing script was installed in a directory only writable by adminstrator. Is there a directory that is reliably writable? Would cwd generally work?