Add int specialization for None
Add int specialization for None

pombredanne/pythran,pbrunet/pythran,pbrunet/pythran,hainm/pythran,pbrunet/pythran,serge-sans-paille/pythran,hainm/pythran,pombredanne/pythran,hainm/pythran,artas360/pythran,serge-sans-paille/pythran,artas360/pythran,pombredanne/pythran,artas360/pythran