Update the wunderground example so that it works with the final SODAQ
Improve the readLine logic a bit to handle the optional LF after CR

I keep messing this up, so please check it and let me know if I screwed
up again.

Also added new functions to enable / disable LTS (never seen it working).
And a new function to read CCLK.
Add a README for the wunderground example
Merge branch 'master' of github-sodaqmoja:SodaqMoja/GPRSbee