Lookup mimetype by resourcePath if not supplied

This will lookup the mime type if not supplied with the https://www.npmjs.org/package/mime library. Primarily for convenience so I don't need to specify each within the config: `test: /\.(png|svg|woff|eot|ttf|otf)$/, loader: 'url?limit=100000'`

Sorry for CRLF change in the `package.json` btw.