Load html partials into index.html

[foucist]

I asked about it in #17 but managed to get it working with html-loader.

I tried to do it with only the html-webpack-plugin that's already included, but it seems like it depended on html-loader anyways according to the error messages I got.

Example at: https://github.com/jantimon/html-webpack-plugin/tree/master/examples/custom-template