default projects merge and improve

default:
add license header
initialize transceiver thread for all available transceivers
add radio thread when transceiver is available
register radio thread with transceiver for available transceivers
clean up imports
clean up Makefile
set default target to native
include all available modules for native target
add -DSCHEDSTATISTICS option (disabled by default)

default-native:
remove default-native project
clean up transceiver initialization

Move initialization to separate function.
Make use of the transceiver APIs ability to pass several transceivers
at once.
add sht11 for msb-430
Merge pull request #54 from LudwigOrtmann/default-default-native-fusion

default projects merge and improve
test for race condition in hwtimer_spin
INCLUDES, add chronos board

set INCLUDES according to the transceiver being used
Merge pull request #55 from LudwigOrtmann/test_hwtimer_spin

test for race condition in hwtimer_spin
add a thread & msg test
Merge pull request #56 from LudwigOrtmann/default-update

INCLUDES, add chronos board
add valgrind option to Makefile
Merge pull request #58 from mehlis/vg-makefile

add valgrind option to Makefile
removed useless Makefile complexity
added useful compiler switches
Merge pull request #59 from mehlis/ccn-lite-follow-up

Makefiles: ccn lite follow up
add licenses to my code
Merge pull request #60 from mehlis/license

add licenses to my code
change default target to native for most projects

implements https://github.com/RIOT-OS/RIOT/issues/202
some projects don't make sense for native because they test hardware
    native does not support
put spaces around all = characters
fix some indentations for if/endifs
set all RIOTBASE paths to ../../RIOT
fix extraneous text after else directive in tlayer/Makefile
fix pingpong printf
fix pingpong_sync printf
fix pingpong_sync project name