fix C++11 warning
fix C++11 warning

reported by Glen Hansen.

I think C++11 introduces magic meaning
so some symbols that come right after
a string, so normal people have to add
spaces for non-magic behavior.

yangf4/core,yangf4/core,YetAnotherMinion/core,YetAnotherMinion/core,YetAnotherMinion/core,yangf4/core,YetAnotherMinion/core,YetAnotherMinion/core,yangf4/core,yangf4/core