Adds Fuubar (and updates gems).
Converts <b> to <h2> when displaying a note.
Conforms more to styleguide.
Increases test coverage.
Increases test coverage for OpenLibrary API calls.
Improves test coverage for Books.
Conforms better to style guide.
Converts <b> to <h2> when sanitizing.

Evernote seems to add <b> rather than <strong> under certain
circumstances.
Adds livereload, sass and coffeescript guards.

Also updates gems and tidies up Gemfile.