MBLBP is cdef function now. Corrected the example repeated imports.

doc/examples/plot_multiblock_local_binary_pattern.py

@@ -55,12 +55,9 @@ print(lbp_code == correct_answer)
 """
 Now let's apply the operator to a real image and see how the visualization works.
 """
-from skimage.util import img_as_float
-from skimage.transform import integral_image
 from skimage import data
 from matplotlib import pyplot as plt
-from skimage.feature import (multiblock_local_binary_pattern,
-                             draw_multiblock_lbp)
+from skimage.feature import draw_multiblock_lbp
 
 test_img = data.coins()