Merge pull request #6388 from astralien3000/opencm9-04

boards/opencm9-04/Makefile

boards/opencm9-04/Makefile.features

boards/opencm9-04/Makefile.include

boards/opencm9-04/board.c

boards/opencm9-04/dist/robotis-loader.py

boards/opencm9-04/include/board.h

boards/opencm9-04/include/periph_conf.h

cpu/stm32f1/ldscripts/stm32f103cb_opencm9-04.ld

examples/dtls-echo/Makefile

examples/gnrc_border_router/Makefile

tests/thread_cooperation/Makefile

tests/unittests/Makefile