Histogram Backprojection Implementation

-- Implemented Histogram Backprojection

>>> from skimage.exposure import backproject as bp
>>> res = bp.histogram_backproject(img1,img2)

-- works for both grayscale and color images (good for color images)

-- result is here : https://github.com/abidrahmank/MyRoughWork/blob/master/scikit_roughworks/img.png

-- corresponding OpenCV result is here : http://2.bp.blogspot.com/-yd1yWl_UuTE/UUFa7jMHPXI/AAAAAAAAAmw/eMGfAk1xung/s1600/res.jpg

Please let me know if any errors or modifications, 
Regards
Abid K