Request: Allow the core Javascript/Stylessheets over 300kb.

Use Case: I am using webpack with Babel which compiles my JS files into a single minified package. The same process is done with styles.css. 

Justification: As a theme developer, I have a large amount of complex customizations 1000s Lines of Codes for my theme in javascript. Babel allows me to write in modern standards and still have legacy browser support.

I can split these up into smaller files, but due to the guide theme being essentially being a monolithic javascript application as laid out in the copenhagen theme. I would prefer the production Javascript to be in a single file. As well as the stylesheets.

The other option would be better support of dynamic file loading/cdn support for guide hosting so we could use automated webpack splitting.