Consider move YAML back to JSON

[dmarcos]

YAML breaks consistency for a marginal benefit. We use JSON everywhere and introducing something different adds more confusion than help. JSON is already simple enough

[fernandojsg]

I actually agree with @dmarcos , even if it's simple it doesn't add any real benefits and in fact when I read at it I don't see it as clear as if I'm reading JSON that it's what most javascript coders are used to.

[ngokevin]

ok will do later