Return a NULL pointer when receiveLineTCP times out
Add the possibility to get diagnostic output

The sodaq_wunderground example uses SoftwareSerial for diagnostic output

There is also a bugfix in sendPWS with receiveLineTCP.
Need to properly declare diagport in example
Improve make-zip.sh to keep directory structure
Move the example in the right place and use Sodaq_DS3231 instead of DS3231