Merge pull request #8884 from haukepetersen/add_skald

Makefile.dep

boards/common/nrf52xxxdk/Makefile.dep

boards/common/nrf52xxxdk/Makefile.features

cpu/nrf5x_common/Makefile

cpu/nrf5x_common/include/nrfble.h

cpu/nrf5x_common/radio/nrfble/Makefile

cpu/nrf5x_common/radio/nrfble/nrfble.c

drivers/include/net/netdev/ble.h

examples/skald_eddystone/Makefile

examples/skald_eddystone/README.md

examples/skald_eddystone/main.c

examples/skald_ibeacon/Makefile

examples/skald_ibeacon/README.md

examples/skald_ibeacon/main.c

makefiles/pseudomodules.inc.mk

sys/Makefile

sys/auto_init/auto_init.c

sys/include/net/ble.h

sys/include/net/eddystone.h

sys/include/net/netopt.h