Adding Octagon structural element
Removing circular import
Correcting grammatical typo
Making the doc more explicit
Added star structural element
Minor doc changes
Test for Octagon
Improving the implementation of star
Adding namespace
Adding test for star
Adding tests for smallest selem
Remove unused cached_property from _shared.utils namespace
Improve fromatting of regionprops doc string
Hide cached_property and caching flag
Merge pull request #669 from ankit-maverick/octagon

Adding Octagon structural element
Fix radon example script
Merge pull request #677 from ahojnnes/radon-example

Remove UTF-8 from radon example.
Merge pull request #676 from ahojnnes/regionprops-fixes

Regionprops cleanup.
Use Py_ssize_t instead of int in _slic_cython
Change 'long' to 'int' in Cython docs