2013-11-20: 2.0.0 (3c8f2a9)
- Initial version

2014-03-27: 2.0.1 (6be1369)
- Add bit banged I2C clear bus in constructor

2015-04-14: 2.0.2 (06c81f6)
- Show initial counter value
- Don't strip final zero if counter value is zero
- Turn all segments off on startup