Edit suggestions

Feel free to undo any of the wording changes you don't like. I wanted to change a lot of the “we”s in this article to “you”s, but I refrained because you're consistent throughout.

* The folder name your app lives in is called “Blank”, which seems odd.
* In your app.js `'deviceready'` should use double quotes for consistency.
* In your repo you're using 2 spaces for tabs but the markup in your tutorial uses 4.
* The favorites switch does not persist for me. That is, if I favorite a book, go back to the list, and return to the details, the switch is not set.
* Excellent choice of books, although I was looking for something on polyfills :)