Remove __strong from all instance variables as it is the default variable qualifier.
Initialize the user interface when the application is initialized.

An APP_INIT event is published to the event bus once all application
objects are created and initialized. The user interface agent listens
for this event and initializes the user interface by switching it to
idle state, setting the remaining time to zero, and setting the
pomodoro count to zero.
Moving files around.

- Agent classes moved to directory/group called Agent.
- Synthetic event publisher moved to directory/group Event.
Moving test files around.

- Agent tests moved to directory/group Agent.
- Synthetic event publisher tests moved to directory/group Event.