Still polishing some stuff.
Includes es2015, cssnext and a nice build system.
Easily configurable, uses rollup and postcss.
Just place index.html and all your stuff inside /dist directory.
Install all dependencies with npm install
Start in development mode with npm start
Build for production with npm run build
I haven't added any hot-code reload functionality, but I recommend installing browser-sync and running browser-sync start -s dist --files dist/**/* from the project root.