Update README to better match backbonejs.org

line 14 readme missing the word "with":
Backbone supplies structure to JavaScript-heavy applications by providing models key-value binding and custom events, collections...
--> on backbonejs.org reads as -->
Backbone.js gives structure to web applications by providing models with key-value binding and custom events, collections...

Also bolded models, views and collections just as they are on backbonejs.org