add style loaders

[alkhe]

wip on https://github.com/edge/cyc/tree/style

• [x] style-loader
• [x] css-loader
• [x] sass-loader
• [x] bulma
• [ ] custom styles
• [ ] style sample app

[iambumblehead]

+1

also a less-loader would be great. i had difficulty adding stylesheet hot-loading. This other boilerplate repository hot loads stylesheets https://github.com/christianalfoni/webpack-express-boilerplate