add c++14 implementation proposal of std::experimental::optional (to be removed once NVCC is compatible with c++14)
add c++14 implementation proposal of std::experimental::optional (to be removed once NVCC is compatible with c++14)

JonathanRaiman/Dali,JonathanRaiman/Dali,JonathanRaiman/Dali,JonathanRaiman/Dali