[WIP]Try to run Pacproxy with Node.js

On Windows environment, it is difficult to run javascript runtimes which like therubyracer.
So, I want to add Node.js runtime. I need to do followings.

- [ ] autodetect to run with Node.js
- [ ] enable to run with Node.js
- [ ] improve speed with Node.js
- [ ] enable to run Node.js on both Windows and *nix.
- [ ] build npm installation process
- [ ] build CI processes for both therubyracer and Node.js