For security reasons, refactor Util class to prevent against class instantiation. Add new app keys from Dropbox App console
Refactor MainActivity to extend ListActivity, refactor its layout
Implement loader to list folder content asynchronously. Add static method to Util class to retrieve file system
Implement book list as a fragment to use Loaders and Fragments from support package, also use it as a fragment with vision of tablets screen support
Add refresh menu item. Rename some clases for better undestand
Fix activity name bug in AndroidManifest
Fix bug at sign out, dropbox account must be null checked
Add progress bar and empty view to book list. Implement book list row
Implement book list adapter
Add last modified date to book list row
Implement epub file extension selection criteria
Refactor file extension selection criteria to select files from any extension, passed by parameter
Some refactors
Forgot refactor from previous commit
Merge pull request #3 from vicfran/feature/book-list

Feature book list