Quote special characters in urls

[saimn]

This is a quick and untested rebase of an old commit. Needs some testing.

[saimn]

@alcoralcor - Do you think that you could test with this branch ? It would really useful.

[codecov]

Codecov Report

Merging #345 into master will increase coverage by 0.07%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #345      +/-   ##
==========================================
+ Coverage    87.4%   87.47%   +0.07%     
==========================================
  Files          19       19              
  Lines        1421     1429       +8     
==========================================
+ Hits         1242     1250       +8     
  Misses        179      179

Impacted Files	Coverage Δ
sigal/utils.py	90.9% <100%> (+0.16%)	⬆️
sigal/gallery.py	89.01% <100%> (+0.17%)	⬆️

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[alcoralcor]

I've done some tests.
In "<img src=...", only file name is encoded. Path isn't. So, thumbnails are not loaded into page when there's a special char in path. They are loaded in last directory level because there are no more path, except "thumbnails/".
Lots of special chars have been used, all are well encoded when they are ... (in "<a href=" or file names as mentioned above).
I've tested this in all themes (galleria, colorbox and photoswipe). I'm running Python 3.6.6.

[saimn]

Thanks for the testing @alcoralcor , hopefully it should be good now!

[alcoralcor]

Everything's working properly now @saimn ! Thank you for the fix !