Added an example for Backbone.js and Require.js

ExtJS 4 Todo addition

jQuery example - added count on Clear button

Also some selector caching and other small optimizations.

Adding jQuery-only todo example. This will be more clearly made available in TodoMVC 0.3 along with the other new examples coming soon.

Quick once-over of the grammar/punctuation in the README

quick fix to angular-persistence demo

New Example using AngularJS + PersistenceJS

Adding Broke.js example.

Fix the URL :)