Define mixin for seamless integration with jQuery and Backbone

[bruth]

It is quite hideous having to wrap objects with the Synapse constructor:

Synapse(obj).observe(...)

Assuming noConflict is not set, one should be able to do this:

var model = new Backbone.Model;

$('input').observe(model);
// or
model.observe('input')

[bruth]

Does not need to be limited to these types. See #11