(meta API fix) Renaming everything to cord ... 'cause fuck you npm, that's why.

(`yarn` was already taken on NPM by some project that hasn't had a commit in over a year. ddis.)
(fix) Updating everything to work with modern Node idioms.

Surprisingly, this doesn't change the API. It still works with `poopy.js`; but now you can do
something like `new cord.constructor()` instead of `cord.beget()`, if you wish.

Also had to depend on lodash, to replace APIs lost in Node upgrades. Will eventually need this to
replace ES5 constructs for client-compatibility *anyway*.
(fix ex) Updating all the examples!

Well, that was a fast refactor. :)
(- fix) Fixing a missing variable-guard, bugging out REPLs