[Prototype-core] A callbacks module for adding before/after hooks to object methods

[Pat Nakajima]

I've started putting together a way to specify per-object before/after
callbacks for any method. Probably not something to go in core, but
maybe something that would be interesting to core contributors.

There are some examples in a GitHub wiki (http://github.com/nakajima/
nakatype/wikis/callbacks), but basically, you specify callbacks like
so:

  var someArray = [1,2,3];

  Callbacks.add(someArray, {
    before: {
      push: function(entry) {
        var msg = 'about to push ' + entry + ' on array: ' +
this.join(', ');
        console.info(msg);
      }
    },

    after: {
      push: function(entry) {
        var msg = 'just pushed ' + entry + ' on array: ' +
this.join(', ');
        console.info(msg);
      }
    }
  });

  someArray.push(4);

In addition to adding 4 to someArray, the above code snippet will log
to the console before and after.

If anybody has any suggestions/criticisms/threats, please do share!
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