Add a way to declare auto functions.
Add a way to declare auto functions.

From c++0x

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