Added license
Fixed GPRMC messages received before GPGGA
Added xref exceptions.
add nmea_0183_srv:unsubscribe/2
Add uart dependency
make baud rate adjustable
handle empty date strings in nmea messages
Merge pull request #1 from tolbrino/integr

Combination of recent changes
merge fix
Merge branch 'Feuerlabs-master'
using uart from tonyrog