Deno peer

[tylerchilds]

Stable work in progress-- ish.

All the commands in the readme start, but deno.js a direct port of demo.js, with only switching require to import and then running with deno.

This command fails with

error: Error in node-web-streams@0.2.2 parsing version requirement for dependency: web-streams-polyfill@git://github.com/gwicke/web-streams-polyfill#spec_performance_improvements

Invalid npm version requirement. Unexpected character.
  git://github.com/gwicke/web-streams-polyfill#spec_performanc
  ~

Caused by:
    0: Invalid npm version requirement. Unexpected character.
         git://github.com/gwicke/web-streams-polyfill#spec_performanc
         ~
    1: Unexpected character.
         git://github.com/gwicke/web-streams-polyfill#spec_performanc
         ~

pending a fix to the web-streams-polyfill dependency, we'll likely face issues with the require statements in index.js and below.

[tylerchilds]

i’ve resolved the require issues in index.js as a fork in braidmail.js

we’re back the the web-streams-polyfill error. pending that, this pr is pretty close.