Add decks content provider.
Change decks fragment to use cursor loader.
Fix provider work with registering.
Remove database initialization via application.
Remove decks loading sign.
Merge branch 'loading-without-sign' into content-providers
Add saving of decks listview position on configuration changes.
Remove closing of deck cursor.

CursorLoader does it itself, double closing could cause crash.
Add support for CRUD deck-related operations.

* Add almost all decks provider functionality.
* Add support for UI manipulations.
* Use Otto bus for safe async operations.
* Change code to fit everything above.
Merge branch 'dev' into content-providers
Add support for viewing cards list.
Add card creation support.
Add card deletion support.
Add card editing support.
Add very basic cards pager support.
Remove not used UI code.
Refactor provider and rename it to GambitProvider.
Fix typos in UI code.
Add Otto to licenses.
Add Otto to the readme file.