Fix rank filter kernels
Wrap code at 80
Do not use importlib in tifffile_local to avoid warnings
Improved docstring
Beef up docstring
Add tests for all rank filters and reformat code
Merge pull request #1244 from ahojnnes/rank-fix

Fix rank filter kernels
Install simpleitk from wheelhouse if available
Merge pull request #1274 from blink1073/use-wheelhouse-simpleitk

Install simpleitk from wheelhouse if available
Do not try and install SimpleITK on Py3.2 or 3.4
Fix boolean logic for SimpleITK install and add warning
Merge pull request #1272 from blink1073/fix-tifffile-warning

Do not use importlib in `tifffile_local` to avoid warnings
Fix typo in bash conditional
Merge pull request #1275 from blink1073/use-wheelhouse-simpleitk

Do not try and install SimpleITK on Py3.2 or 3.4