cpu: added enableIRG implementation to cpu/lpc1768
hwtimer: clean up of interfaces to board/cpu
Merge pull request #919 from haukepetersen/hwtimer_cleanup

core/cpu: renamed ARCH_MAXTIMERS to HWTIMER_MAXTIMERS
Merge pull request #923 from haukepetersen/mbed_enableIRQ

cpu: added enableIRQ implementation to cpu/lpc1768
tests/pkg: fixed issues from #919
Initial import of low-level GPIO driver interface
Fixed spelling errors
Merge pull request #612 from haukepetersen/periph_driver_gpio

Initial import of low-level GPIO driver interface
Merge pull request #929 from haukepetersen/hwtimer_cleanup_fix

tests/pkg: fixed issues from #919
icmp.c: remove empty else clause
Merge pull request #936 from RIOT-OS/fix_else

remove empty else clause