Added logging enter/leave events.
Fixed annoyance with reloading page after submitting presence.
Silenced logs on "nothing changed" enters/leaves.
"Hello world" no longer needed.
Added skeleton API.
Implemented API for posting and deleting sensors.

Not the list sensors yet.
Added support for sensors sending array of data.
Dropped field "name" from API description.
Allowed POST for /api/v1/person/<nick>.
Added logging erroneous requests.
wlokalu.api.presence made The Way[tm] to use database.
A mistake: split() takes not the resulting fields number.
Added listing sensors' states.
List of (simple) sensors displayed on web page.
Changed name/subname delimiter in sensors.
Removed unused field from ListSensor.
Changed nomenclature about sensors.

It felt awkward, but now it has better names.
Allowed slash to occur in person's nick.
Simplified writing REST handlers.
Added support for GET requests.