Merge pull request #2540 from josephnoir/topic/cpp-stl-compatibility

Makefile.dep

core/include/native_sched.h

core/include/sched.h

cpu/stm32f4/startup.c

sys/Makefile

sys/Makefile.include

sys/cpp11-compat/Makefile

sys/cpp11-compat/condition_variable.cpp

sys/cpp11-compat/doc.txt

sys/cpp11-compat/include/riot/chrono.hpp

sys/cpp11-compat/include/riot/condition_variable.hpp

sys/cpp11-compat/include/riot/detail/thread_util.hpp

sys/cpp11-compat/include/riot/mutex.hpp

sys/cpp11-compat/include/riot/thread.hpp

sys/cpp11-compat/mutex.cpp

sys/cpp11-compat/thread.cpp

tests/cpp11_condition_variable/Makefile

tests/cpp11_condition_variable/main.cpp

tests/cpp11_mutex/Makefile

tests/cpp11_mutex/main.cpp