cpu/nrf51822: changed ISR stack size to 512 byte
boards: adjusted TIMER_0 defines for NRF based b.

adjusted for
- pca10000
- pca10005
- yunjia-nrf51822
cpu/nrf51822: fixed timers

- changed TIMER_0 to be a 24-bit timer -> see Nordic PAN #32
- cleaned up timer initialization code
- added check if an interrupt channel was active
cpu: adjusted IRQ stack sizes for Cortex CPUs
Change in endianess of destination address, maybe doesn't work on other platforms
Change to cast, to maybe not crash on memory allignment
Mosly shit, debug messages and stack sizes
Merge branch 'master' of https://github.com/RIOT-OS/RIOT into beehive
iot-lab_M3: flashing works fine w/o device_desc
samr21: implemented transceiver via spi, gpio changes
core/sched: unify DEBUG text syntax, nomenclature
Merge pull request #1999 from LudwigOrtmann/sched_debug_unify

core/sched: unify DEBUG text syntax, nomenclature
transceiver: fix ignore command for 802.15.4 radios
oneway-malloc: fix prototype for calloc

The prototype differs from stdlib
ccn-lite: use always ccnl_malloc
Merge pull request #2001 from OlegHahm/oneway_calloc_signature

oneway-malloc: fix prototype for calloc
Merge pull request #2000 from OlegHahm/ieee802154_transceiver_ignore

transceiver: fix ignore command for 802.15.4 radios
Merge pull request #1827 from haukepetersen/fix_nrf_timer

cpu/nrf51822: fixed timers
Merge pull request #1996 from OlegHahm/iot-lab_m3-no_device_desc

iot-lab_M3: flashing works fine w/o device_desc
ipv6: fix IPv6 address matching algorithm