Merge pull request #4071 from thomaseichinger/hauke-fix-gpio-gpiodev

boards/fox/include/board.h

boards/fox/include/periph_conf.h

boards/iotlab-m3/include/board.h

boards/iotlab-m3/include/periph_conf.h

boards/limifrog-v1/include/board.h

boards/msb-430/include/periph_conf.h

boards/msb-430h/include/periph_conf.h

boards/msbiot/include/board.h

boards/nucleo-l1/include/periph_conf.h

boards/saml21-xpro/board.c

boards/samr21-xpro/include/board.h

boards/samr21-xpro/include/periph_conf.h

boards/spark-core/include/board.h

boards/spark-core/include/periph_conf.h

boards/telosb/include/periph_conf.h

boards/wsn430-common/include/periph_conf.h

boards/z1/include/periph_conf.h

cpu/atmega2560/include/periph_cpu.h

cpu/lpc2387/include/periph_cpu.h

cpu/msp430fxyz/include/periph_cpu.h