Make sure parameter is not nul either.
re-sync customary conversion/units with new properties
add debug versions for node v0.10.22 network code
Merge pull request #241 from siburny/master

Make sure parameter is not null either.
in anticipation...
update to latest netatmo API
New icons - (media-receiver, on-off, outlet, sensor-wind)
New popover icons - (media-receiver, on-off, outlet, sensor-wind) #215 #227 #233