This seems like a step in the right direction to me.

I was wondering about the flexibility of templating engine and CSS preprocessing. It seems like hr.js is using it's own templating engine, which is ok and also LESS as a CSS preprocessor.

Is there a way to use something like Handlebars, ejs,... or maybe switch to Stylus or SASS? (is it just a matter or defining a css compiler in the build configuration)

Great work, keep it up.