Reduce file size of built version

[jonathanweiss]

The build version (in /dist) is quite large with 189 KB. My guess is that the polyfills and Babel cause a lot of overhead since the code in /src ist ~8KB (non-minified).

• Analyse the webpack file with source-map-explorer
• Do we need all Web component polyfills?
• Is it possible to provide a ES6 module that be be included in a project without the overhead from Babel?