Adding jshintrc
util/curry: implementation and test

This provides a curry function such that
Given f(x, y), curry(f)(x) returns f_(y)

Fixes #47
trait/pubsub: refactor/rewrite

Since it was originally simply taken from Backbone.Event, trait/pubsub
is now rewritten using more nbd ideas/styles. It remains mostly similar
to Backbone's implementation, being heavily inspired by it.

Fixes #50