Fix handling of POWER_SUPPLY_TIME_TO_* properties #504
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The POWER_SUPPLY_TIME_TO_* properties provided via sysfs have to be interpreted as seconds. Further, the presence of both the POWER_SUPPLY_TIME_TO_EMPTY_NOW and POWER_SUPPLY_TIME_TO_FULL_NOW properties confused the logic and ended up always showing the time-to-full as 0 while charging (since TIME_TO_EMPTY reports 0 with a charger attached).
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According to the linux kernel documentation, the POWER_SUPPLY_TIME_TO_* properties provided via sysfs have to be interpreted as seconds, not minutes:
https://github.com/torvalds/linux/blob/master/include/linux/power_supply.h#L22
The driver that was originally used for developing support in i3status (#378) is broken, since it incorrectly returns the time-to-empty in minutes instead of seconds.
Further, POWER_SUPPLY_TIME_TO_EMPTY_NOW is present even when charging, but reports a value if "0" then. This confuses the logic and ended up always showing the time-to-full as 0. The proposed patch fixes the unit interpretation, as well as added code to parse both time-to-empty and time-to-full, disregarding zero-values.