uart: Add #ifdef guards in initialisation.
sc.c: Fix compiler warning.
sc: Rename SC_INIT_* to SC_MODULE_*.
gsm: Remove dependency to slre.

Add #ifdef guards for gsm code.
all: Add deinitialisations.
Power: Rewrite.
nmea: Fix compiler warnings.
log: Fix compiler warnings.
event: Add GSM event.
nmea: Not living in the 90's anymore.
uart: Send multiple messages in case of long str.
sdu: Send multiple messages in case of long str.
sha1: Add #ifdef guards.
utils: Introduce SC_MAX(a,b) macro.
gsm: Bunch of changes. Still WIP.
build: Include sha1 to RT project.
pwr: Clear the RTC interrupt and start clocks.
event: Handle no-op message.
nmea: Add NMEA parser from RuuviTracker.
Remove TinyNMEA parser.