[Merge] lp:~renatofilho/address-book-app/keyboard-navigation into lp:address-book-app

[Renato Araujo Oliveira Filho]

> In edit mode, tab key and arrow keys should navigate to the Add Field button
> and Delete buttons, currently these are skipped in the navigation.

The current SDK does not have focus visual feedback for buttons, allowing it to receive focus can cause confusion since the user will never know which button or item has focus or not.
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https://code.launchpad.net/~renatofilho/address-book-app/keyboard-navigation/+merge/277176
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