Echo JS 0.11.0

I'd disagree with MaxArt.
There are more things which wouldn't be available in ECMAScript in the next few years:
- types
- all variables *and* object fields are immutable by default
- ADTs & pattern matching
- compile-time auto-currying

Block as expressions (`do` and others) are minor things as well as special keyword for recursive functions or Pascal-like range loops, which do not define key language features.

But I'm still not convinced the language is really useful. We already have tons of languages, including BuckleScript – an Ocaml specifically designed to be compiled into JS.