initial support for the mbed NXP LPC168

 * http://mbed.org/platforms/mbed-LPC1768/
added thread.h include (necessary since 227c847135c5d85cf0e9fe5770f5c47a0e5cba3b)
handle sigterm, inform about exit

resolves #445
Merge pull request #447 from OlegHahm/thread_include

added thread.h include (necessary since 227c847135c5d85cf0e9fe5770f5c47a0e5cba3b).
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clean up msp430 cpu-conf.h
fix main return for msp430

mspgcc handles main specially, this introduces code to make main
behave normally
stack alignment workaround

Should be fixed in thread.c instead, this is just a temporary
workaround to enable msp-430 threads in the mean time.
improve programmer handling in msb-430-common
msp430 lpm stub
add some documentation to lpm.h
added ENABLE_DEBUG macro
remove suprerfluous thread_yield declaration
added missing thread include
Merge pull request #448 from LudwigOrtmann/pyterm

handle sigterm, inform about exit
Merge pull request #449 from mehlis/fix-yield

Fix yield (missing part)
Initial import of crypto libs from SecureMicroMesh

- Imported files from secure micro mesh library
- added Makefiles and included libs into sys/Makefile
Removed deprecated asserts from 3des and aes
Removed some redundant \0 string terminators
Merge pull request #446 from LudwigOrtmann/msp

fixes for msp430, msb-430 and msb-430-common