Updating exercises to include latest version of Backbone (v1.0.0) & Underscore (v1.5.2)
Clarifying Backbone Exercise 1 instructions
Adding an 'asin' attribute to the BookModel in the Backbone Models slide to show how initialize uses it
Merge pull request #38 from JohnRiv/backbone

Updating Backbone.js & Underscore.js source files & a couple tweaks to the Exercise 1 slides & instructions