isRunning now returns False after Pomodoro is interrupted.
Can now query the timeRemaining on a Pomodoro.
Renamed variables which don't need name mangling.
After creation the timeRemaining is now the total duration of the
Pomdoro.
After Pomodoro ends, its neither running nor interrupted.
Simplified the internal state of a Pomodoro.
When idle, the timeRemaining is the Pomodoro duration in seconds.
Added a runnable example which starts a minute Pomodoro and prints
When idle, the timeRemaining is the Pomodoro duration in seconds.
Added a runnable example which starts a minute Pomodoro and prints
"timeup!" when it completes.
Commented example.