Change _template.match_template variables to float.

Template and image in test are converted to float32 before passing to `match_template`. This change is temporary: `match_template` should convert these variables internally.

skimage/feature/tests/test_template.py

@@ -5,8 +5,9 @@ from numpy.random import randn
 
 def test_template():
     size = 100
-    image = np.zeros((400, 400))
+    image = np.zeros((400, 400), dtype=np.float32)
     target = np.tri(size) + np.tri(size)[::-1]
+    target = target.astype(np.float32)
     target_positions = [(50, 50), (200, 200)]
     for x, y in target_positions:
         image[x:x + size, y:y + size] = target