gist:6399102

// This module uses AP2 as its starting point:
// https://github.com/domenic/promises-unwrapping

var hasOwn = Function.prototype.call.bind(Object.prototype.hasOwnProperty);

function mixin(a, b) {
  Object.keys(b).forEach(function(key) {
    a[key] = b[key];
  });
  return a;