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
posix: add pthread test case
add local storage variable test