Port to Windows

[micahflee]

This will be a big one. All dependencies will need to be bundled, e.g. gnupg.exe. There's also some Linux-specific code:

• When checking for updates, choosing the right version
• Probably process management and definitely bringing windows to front

[micahflee]

While it would be great to have this functionality in Windows and OSX, I don't think it's quite realistic. Windows and OSX already have nicer usability/updatability than Linux, and doesn't have things like sane dependencies (so I'd have to bundle my own gpg, and updating over Tor would be a ridiculous packaging nightmare).

I think I'll let the Tor Browser Bundle team figure out how to deal with those platforms.