ENH: Add `doctest_skip_parser` allowing conditional skipping of doctests
FIX: Skip `viewer.show()` commands which hang Travis
Merge pull request #821 from JDWarner/add_conditional_doctest_decorator

ENH: Add `doctest_skip_parser` allowing conditional skipping of doctests
Improve layout of gabor example plot
Fix and improve circular hough hough transform example script
Fix overlapping text
Fix overlapping text
Improve local otsu example script
Fix overlapping xtick labels
Show hidden text
Improve ssim example
changing docstring to make clear that only 2-D images are currently supported
Merge pull request #839 from rtack/match_template_DOC

Change docstring to make clear that only 2-D images are currently supported.
Add missing plot directive
Merge pull request #838 from ahojnnes/gallery

Gallery improvements
remove regionprops deprecation warnings