Fix missing label property description and backwards compatibility
Merge pull request #688 from ahojnnes/regionprops-bugfix

Fix missing label property description and backwards compatibility of regionprops.
Added elements to the coffee picture docstring.
Changed the 180 constant in bin calculation to avoid rounding errors

The code
   180 / orientations
performs integral division in python < 3,
leading to the calculations ignoring some orientations near the 180 maximum
Added partial implementation of censure for mode=DoB
Line Suppression of the response
Correcting import for a private function
Adding TODO's
Added mode Octagon using np.convolve
Correcting typo
For loop for mode=DoB in Cython
Commenting out _filter_using_convolve
Removing time() statements and correcting types in censure_cy
Removing hard-coding in censure_keypoints()
Returning keypoints with the scale info
Correcting the expression of response in censure_keypoints()
Correcting the definition of Ratio of Principal Curvatures
Adding _slanted_integral_image. Removed _oct and _filter_using_convolve
Removing unused stuff
Cleaning up the non-Cython version for mode=Octagon