made minor changes in syntax
1. merged is_url and file_or_url_context in one import statement
2. changed syntax to check if path is a URL. now more compact
improve performance of equalize example

percentile can compute multiple ranks in one go which in the case of the
example halves the required time.
Merge pull request #922 from juliantaylor/doc-improve

Improve performance of equalize example
Fix warp doctest and example
Fix regular grid doctest
Always Skip doctests which depend on Qt and are in the class doc string

The doc test skip directive modifies the __doc__ attribute, which is not
possible for new-stlye classes.
Improve function name in warp example
Move phase unwrapping algorithms to restoration submodule
Move denoise functions to restoration submodule
Fix restoration example imports
TST: Add unit test for mesh orientation correction.
FIX: Slight speed decrease for backwards compatibility
Merge pull request #915 from vighneshbirodkar/blob_det

Blob dection (LoG)
used plt.subplots everywhere
Update bento
Merge pull request #923 from ahojnnes/doctests

Fix doctests
changed colorbars
Merge pull request #916 from neerajgangwar/master

Add loading from URL in novice module
changed to fig.colorbar
changed to plt.subplots()