* Add and use speed constants
* Add and use meter based volume and area constants
* Add and use more mass unit constants
* Add and use concentration unit constants
* Add and use watts per square meter constant
* Use more time constants
* Use more data constants
* Add and use time related constants
* Sort time constants and reuse them in data rate constants
* Fix greeneyemonitor import
* Fix greeneyemonitor import V2
* Fix failing here_travel_time test
* Add TIME_MONTHS and TIME_YEARS
* Use TIME_MINUTES in opentherm_gw and isy994
* Add and use TIME_MILLISECONDS
* Change inconsistent ones
* Add TIME_MICROSECONDS and TIME_WEEKS
* Use constants in apcupsd and travisci
* Fix import error in upnp sensor.py
* Fix isy994 sensor.py using TIME_YEARS
* Fix dyson tests
* Use TIME_SECONDS in more places
* Use TIME_DAYS in google wifi
springstan
Ville Skyttä
Paulus Schoutsen
Fredrik Erlandsson
Paulus Schoutsen
Diogo Gomes
Fabian Affolter