Import crop into util package namespace

skimage/util/__init__.py

@@ -3,7 +3,7 @@ from .dtype import (img_as_float, img_as_int, img_as_uint, img_as_ubyte,
 from .shape import view_as_blocks, view_as_windows
 from .noise import random_noise
 
-from .arraypad import pad
+from .arraypad import pad, crop
 from ._regular_grid import regular_grid
 from .unique import unique_rows
 
@@ -17,6 +17,7 @@ __all__ = ['img_as_float',
            'view_as_blocks',
            'view_as_windows',
            'pad',
+           'crop',
            'random_noise',
            'regular_grid',
            'unique_rows']