Added BookContents that is partially a wrapper around the JSONObject, offering getters for
specific bits of information
New class ModelFragment to load BookContents, ideally in the background, since reading
an asset and parsing the JSON will take time
War of the Worlds book to be used in the app
Update ContentsAdapter to actually use the BookContents and display the prose on the screen.
EmPubLiteActivity now extends ActionBarActivity to support getSupportActionBar(). Now home button returns to first chapter | onCreate() now uses the ModelFragment
changes