C++11 transition

I've started jet framework as c++98 compliant project but I've decided to change it. From now on jet will be written in c++11. In general breaking compatibility is not a good idea. In this case it's justifiable - I don't have neither energy nor intention to support as much clients as possible - the only user of jet is me.
C++98 served me well but it's time to start using new tricks.