Ractive.js TodoMVC example app

Hi

This is an example TodoMVC app using [Ractive.js](http://ractivejs.org).

Ractive isn't an MVC framework in the traditional sense, it's a DOM manipulation library. But because it is stateful, template-based, and embraces reactive programming principles, it solves the same problems as MVC frameworks.

Its focus is on ease of use and performance. It works by parsing templates and maintaining a 'parallel DOM' in JavaScript land, which reacts to state changes and updates the DOM whenever necessary.

The app is tested in all modern browsers and meets the specification, as far as I can tell. Let me know if you have any questions about it.

Thanks!