fixed byte order in reception of IEEE802.15.4 frames according to the fixed sending in f6c37b0b4fab35ab50aa9095f1c584fb74f92d0a
dont rely on boards/Makefile.base
proper inttype runtime, declare to import

define runtime long as hwtimer_now() uses long
import hwtimer.h instead of declaring hwtimer_now()
rename runtime to reflect the unit of measurement
make ps includes adhere to coding convetions
Merge pull request #334 from LudwigOrtmann/scheduler_clean_fix

scheduler: use proper inttype for runtime, use import instead of declaration, rename to runtime_ticks
Merge pull request #340 from LudwigOrtmann/ps_includes

make ps includes adhere to coding convetions
Merge pull request #332 from LudwigOrtmann/buildtest_update

buildtest: dont rely on boards/Makefile.base
fix and clean up some board Makefiles

enables building wsn430-v1_3b and wsn430-v1_4
fixes some but not all chronos building issues
enable building chronos board
move struct timeval to msp430_types.h
made stacks for RPL threads static and using pre-defined sizes
Merge pull request #307 from OlegHahm/ieee802154_frame_recv

fixed byte order in reception of IEEE802.15.4 frames
Merge pull request #341 from OlegHahm/rpl_fixes

made stacks for RPL threads static and using pre-defined sizes
Merge pull request #329 from LudwigOrtmann/make-all-the-boards

fix build for wsn430-v1_3b, wsn430-v1_4, chronos and some cleaning
use correct length for UDP checksum calculation
Merge pull request #343 from OlegHahm/udp_csum_fix

use correct length for UDP checksum calculation