Static cdef methods.
Some work on cpdef static methods, not complete.

Getting assignment synthesis for the created py_func is troublesome;
it would be nicer if cdef and def functions were truely unified.

Dissallowed for now.
Static method tests.
fix a bug
Merge branch 'master' into static

Conflicts:
	CHANGES.rst
Fix type issues with super().
Tests for py2 style super().
Merge branch 'master' into static
Eliminate vtab lookup for unbound methods.
Merge branch 'cdef_closure'
Merge branch 'master' into static

Conflicts:
	CHANGES.rst
	Cython/Compiler/Nodes.py