Add deprecation warning for old syntax for integrate()

skimage/transform/integral.py

@@ -1,6 +1,6 @@
 import numpy as np
 import collections
-
+import warnings
 
 def integral_image(img):
     """Integral image / summed area table.
@@ -82,6 +82,10 @@ def integrate(ii, start, end, *args):
         end = np.array(end)
     # handle deprecated input format
     else:
+        warnings.warn("The syntax 'integrate(ii, r0, c0, r1, c1)' is "
+                      "deprecated, and will be phased out in release 0.14. "
+                      "The new syntax is "
+                      "'integrate(ii, [(r0, c0)], [(r1, c1)])'.")
         if isinstance(start, collections.Iterable):
             rows = len(start)
         args = (start, end) + args