Merge pull request #6516 from antmerlino/arduino-cleanup

boards/arduino-atmega-common/Makefile

boards/arduino-atmega-common/Makefile.dep

boards/arduino-atmega-common/Makefile.features

boards/arduino-atmega-common/Makefile.include

boards/arduino-atmega-common/board.c

boards/arduino-atmega-common/dist/debug.sh

boards/arduino-atmega-common/dist/debug_srv.sh

boards/arduino-atmega-common/dist/gdb.conf

boards/arduino-atmega-common/include/arduino_board.h

boards/arduino-atmega-common/include/arduino_pinmap.h

boards/arduino-atmega-common/include/board.h

boards/arduino-atmega-common/include/gpio_params.h

boards/arduino-atmega-common/include/periph_conf.h

boards/arduino-common/include/arduino_pinmap.h

boards/arduino-common/include/periph_conf.h

boards/arduino-duemilanove/Makefile

boards/arduino-duemilanove/Makefile.features

boards/arduino-duemilanove/Makefile.include

boards/arduino-mega2560/Makefile

boards/arduino-mega2560/Makefile.features