Online demos

[Igmat]

It could be cool for newcomers to be able to hack examples from test folders in some interactive playground.

Possible solutions (from easiest to hardest)

1. Wait until guys from stackblitz resolve this issue Node Js server stackblitz/core#136;
2. Contact repl.it team and ask for requirements to getting support on their platform as they did for jest;
3. Create our own playground using browser version of VS Code and free plan on heroku
4. Rework baset to be runnable in browser (how it would work with CLI?) - in this case any playground (jsfiddle, plunker, etc.) will fit demo requirements.