Improving Windows Support

Just tried on Windows and wow, I feel sorry for anybody developing on that OS. :cry:
- [x] Disable web security by default for `index.html` to work on first run
- [ ] Source maps are not working
- [ ] All tests are failing because `cross-spawn` stdout is for some reason returning a zero length string (although it prints in terminal). Switching to `child_process#spawn` is throwing another error.
- [ ] Can't use any piping like `devtool foo.js > output.png` with default cmd.exe
- [ ] Can't use `./bin/index.js` to run the examples in run scripts

Probably lots of other issues. But mostly the tool is working for debugging Node apps, which is a good start. :+1: