Add docs and insta-Rust-to-WASM-compile

[killercup]

Also introduces a glorious hack to enable literate programming, incl. a currently unused function that generates modules one the fly (that crashes with some internal node assertion error).

[badboy]

:shipit:

bors r+

[bors[bot]]

:lock: Permission denied

Existing reviewers: click here to make badboy a reviewer

[badboy]

bors r+

[killercup]

bors r-

added travis retry calls on master

[bors[bot]]

Canceled

[killercup]

and again!

bors r+

[killercup]

Ah, sorry bors, I didn't configure appveyor here.

bors r-

I'll not bother you further and just merge this myself.

[bors[bot]]

Canceled