How to add external css files to use as assets.styles in head tag

@erikras Hi Erikras, first of all thank you so much for providing this boilerplate to get started with react and redux large project. The thing I've got stuck is that I've a css folder for my project template and added that in theme folder. But I really don't know that how to see those css files in the web page head tag as ``

I tried to add the following lines in bootstrap.override.scss

```
@import url('css/bootstrap.min.css');
@import url('css/colors.min.css');
@import url('css/components.css');
@import url('css/core.min.css');
```

but getting the following error:

`Module parse failed C:\reactredux\src\theme\css\icons\summernote\summernote.eot?ad8d7e2d......... Line 1: Unexpected token ILLEGAL`

Please help me to get out of this issue. It would be really appreciative.

Thanks a lot again.