0.2.0

+ Added RollingPriceChangeAlarm.
+ Added price direction to Alarm.
+ Added wasUpperLimitHit to PriceHitAlarm.
+ Added get[Upper/Lower]Limit to all alarms.
+ Added comparator for alarm's position.
* PriceChangeAlarm now clears its buffer when a new pair is set.
* Notifier class now checks if alarm is on before showing notification.
* Tests with timing now fully working.
* Refactored SerializationTest to remove repeated code.
- Removed PriceHit[Upper/Lower]AlarmTest, duplicates of PriceHitAlarmTest.