* add support for local ISO8601 timestamp format
added local ISO8601 timestamp format for local rather than UTC-based timestamps
ISO8601 = 2019-03-01T15:32:45.941+0000
ISO8601_Local = 2019-03-01T16:32:45.941+0100 (for TZ GMT+1)
* fixed indentation
* tabs to spaces
* comply with Travis
* comply with Travis once again
* Removed spaces to make Travis happy
* updates
* new elapsed attribute giving the elapsed time since the previous msg
* configurable elapsed attribute
* Update deviceReceive.js
* Update deviceReceive.js
* feat(device_receive): stop caching `forgotten` and `keyerror` properties
After this change, the `forgotten` and `keyerror` properties as emitted
by the Xiaomi Vima Smart Lock will stop being cached. Previously they
were mostly useless, because after they were set to `true`, they were
never being unset or set back to `false` upon a successful unlock.
Close#666
* chore(device_receive): order uncached properties lexicographically
As the list of uncached properties grows over time, it could be
useful to order them lexicographically. This will make life easier
to any developer looking for a particular property in the list, and
in overall makes things look tidier.
