Merge pull request #1000 from OlegHahm/prefix_core_api_functions

boards/avsextrem/drivers/avsextrem-smb380.c

core/bitarithm.c

core/include/bitarithm.h

core/include/debug.h

core/include/sched.h

core/include/thread.h

core/msg.c

core/mutex.c

core/sched.c

core/thread.c

cpu/arm_common/arm_cpu.c

cpu/arm_common/common.s

cpu/arm_common/syscalls.c

cpu/cc430/cc430-gpioint.c

cpu/cortexm_common/thread_arch.c

cpu/lpc1768/atom.c

cpu/lpc1768/cpu.c

cpu/lpc1768/syscalls.c

cpu/lpc2387/gpioint/lpc2387-gpioint.c

cpu/msp430-common/cpu.c