Increase maximum value of pomodoro duration from 60 to 600.

2.2.4

Bump version number to v2.2.4

Fix bug of applescript error.

When $timerName contains quotation mark, applescript may raise error.
Timer.zip

Timer with enhanced script support

1. Add "Get Todo List" script snippet.
2. Add "Save Todo" script snippet.
3. Add shortcut key for force complete timer.
4. Change sounds.