Temporarily remove extract-text-webpack-plugin
Temporarily remove extract-text-webpack-plugin

The extract-text-webpack-plugin leads to a peer dependency error in node 4. This dependency, however, is only necessary in our manual tests. That's why we exclude it for now and re-add it later.

bholloway/sass-loader,jtangelder/sass-loader,bholloway/sass-loader,jtangelder/sass-loader