[Cython] New function (pointer) syntax.

[Robert Bradshaw]

I'd like to propose a more pythonic way to declare function pointer
types, namelye

    type0 (*[ident])(type1, type2, type3)

would instead become

    (type1, type2, type3) -> type0 [ident]

I have a pull request up at https://github.com/cython/cython/pull/333;
what do people think?

- Robert