make im.stretch strong alias to im.resize.

mark im.stretch as deprecated.

_imaging.c

@@ -1626,25 +1626,6 @@ im_setmode(ImagingObject* self, PyObject* args)
     return Py_None;
 }
 
-static PyObject*
-_stretch(ImagingObject* self, PyObject* args)
-{
-    Imaging imIn, imOut;
-
-    int xsize, ysize;
-    int filter = IMAGING_TRANSFORM_NEAREST;
-    if (!PyArg_ParseTuple(args, "(ii)|i", &xsize, &ysize, &filter))
-        return NULL;
-
-    imIn = self->image;
-
-    imOut = ImagingStretch(imIn, xsize, ysize, filter);
-    if ( ! imOut) {
-        return NULL;
-    }
-
-    return PyImagingNew(imOut);
-}
 
 static PyObject*
 _transform2(ImagingObject* self, PyObject* args)
@@ -3026,8 +3007,10 @@ static struct PyMethodDef methods[] = {
     {"rankfilter", (PyCFunction)_rankfilter, 1},
 #endif
     {"resize", (PyCFunction)_resize, 1},
+    // There was two methods for image resize before.
+    // Starting from 2.7 stretch is obsolete.
+    {"stretch", (PyCFunction)_resize, 1},
     {"rotate", (PyCFunction)_rotate, 1},
-    {"stretch", (PyCFunction)_stretch, 1},
     {"transpose", (PyCFunction)_transpose, 1},
     {"transform2", (PyCFunction)_transform2, 1},