use cpu dependent stack size
fix ignore command
use forwarding table entry when routing

So far the entry was looked up, but ignored in the case where the packet
has to be forwarded.
added missing hdr position shift
amendment to 169976f
shell: transceiver: added missing return in error case
Merge pull request #867 from OlegHahm/uart_stacksize

uart: use cpu dependent stack size
Merge pull request #876 from OlegHahm/iphc_decompression_shift

net: 6lowpan: added missing hdr position shift
Merge pull request #875 from OlegHahm/ip_forwarding

net: IPv6: use forwarding table entry when routing
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
msp430: remove expensive modulo call
msp430: show overflow counter in hwtimer debug
msp430: cc430: handle hwtimer interrupts correctly

TAIFG should count the overflows, instead of using the first CCR for this purpose.
Without this commit ARCH_MAXTIMERS returns the wrong number as
effectively one timer less can be used.

Additional fixed comment style and added timer debug.
test_hwtimer: hwtimer is automatically initialized now
msp430: don't enable Timer 0 by default
tests/pkg: fixed issues from #919
Initial import of low-level GPIO driver interface