Fix for windows and Node 0.11.13 (atom-shell)

There may be further issues, but this allowed it to compile against the latest atom-shell, and so far appears to be functional.

BTW, the command to build against atom-shell is:

```bash
npm install --dd --target='0.11.13' --msvs_version=2013 --disturl=https://gh-contractor-zcbenz.s3.amazonaws.com/atom-shell/dist --arch=ia32 --target_arch=ia32
```

The `--dd` turns on full debug, which is hard to get to otherwise. the `--msvs_version=2013` may need adjusted according to which VisualStudio version is installed as well. The `--target` also needs to match the node version in atom-core.