Refactor phonebook's models to merge both implementation. One model
class is used for both main and search results windows.
Improve search by matching entered string against:
- first_name " " last_name
- last_name " " fist_name
Sort results by last_name " " first_name, favs first.
Small improvement to the list view has been added to deal with
asynchronous db reads.
Signed-off-by: Marcin Smoczyński <smoczynski.marcin@gmail.com>
