fix malloc include for OSX
Merge pull request #244 from LudwigOrtmann/fix_hashtable_includes_osx

fix malloc include for OSX
fix signal handler context switch
msp430: add time_t and struct timespec
Merge pull request #248 from mehlis/msp430-timespec

msp430: add time_t and struct timespec
Merge pull request #245 from LudwigOrtmann/fix_tramp

fix signal handler context switch
set stacksizes to default values
print IPv6 addresses in host byte order
use CREATE_WOUT_YIELD on uart0 thread creation

This should remove a race condition in the case that some uart event
occurs after the uart0 thread has started and before control has
returned to the calling thread, as uart0_handler_pid would not have
been set yet.
break long line
Merge pull request #257 from LudwigOrtmann/uart0_thread_create

use CREATE_WOUT_YIELD on uart0 thread creation
implement graceful shutdown in native
Merge pull request #258 from LudwigOrtmann/native_shutdown

implement graceful shutdown in native
improve native README
Merge pull request #261 from LudwigOrtmann/native_README_update

improve native README
merge thread_measure_stack_usage declarations
Merge pull request #260 from LudwigOrtmann/merge_thread_measure_stack_usage_declarations

merge thread_measure_stack_usage declarations
normalize stack defines
add rtc_time function in public header
add rtc_time implementation for native