nicer mixin

mixin.js

// I never remember which one is the mixin and which one is the class.
// And I find `mixin({mixin:..})` too verbose
mixin(fooMixin, fooBar)

// what I rather want:
mix(fooMixin).into(fooBar);

// so...
var mix = function(mixin) {
   return {
      into: function (class) {
         objects.mixin(mixin, class);
      }
   };
}