Merge pull request #1107 from haukepetersen/sam3x8e

boards/arduino-due/Makefile

boards/arduino-due/Makefile.include

boards/arduino-due/board.c

boards/arduino-due/dist/bossac

boards/arduino-due/dist/bossac_osx

boards/arduino-due/include/board.h

boards/arduino-due/include/periph_conf.h

boards/arduino-due/system_sam3xa.c

cpu/cortexm_common/Makefile

cpu/cortexm_common/Makefile.include

cpu/cortexm_common/atomic_arch.c

cpu/cortexm_common/include/core_cm0.h

cpu/cortexm_common/include/core_cm3.h

cpu/cortexm_common/include/core_cm4.h

cpu/cortexm_common/include/core_cm4_simd.h

cpu/cortexm_common/include/core_cmFunc.h

cpu/cortexm_common/include/core_cmInstr.h

cpu/cortexm_common/include/cpu.h

cpu/cortexm_common/irq_arch.c

cpu/cortexm_common/thread_arch.c