Merge pull request #965 from contiki-ng/release-4.3

.gitignore

.gitmodules

.travis.yml

Makefile.gcc

Makefile.include

README.md

arch/cpu/arm/Makefile.arm

arch/cpu/arm/cortex-m/Makefile.cortex-m

arch/cpu/arm/cortex-m/atomic-cortex.h

arch/cpu/arm/cortex-m/cm3/Makefile.cm3

arch/cpu/arm/cortex-m/cm4/Makefile.cm4

arch/cpu/cc2538/Makefile.cc2538

arch/cpu/cc2538/cc2538-conf.h

arch/cpu/cc2538/cc2538-def.h

arch/cpu/cc2538/dev/cc2538-rf.c

arch/cpu/cc2538/dev/gpio-hal-arch.c

arch/cpu/cc2538/dev/gpio-hal-arch.h

arch/cpu/cc2538/usb/usb-arch.c

arch/cpu/cc26x0-cc13x0/Makefile.cc13x0

arch/cpu/cc26x0-cc13x0/Makefile.cc26x0