Update gridism.
Slightly compress jekyll-sticker.jpg.
Merge pull request #3133 from XhmikosR/patch-11
Update history to reflect merge of #3133 [ci skip]
Merge pull request #3132 from XhmikosR/gridism
Update history to reflect merge of #3132 [ci skip]
Add appveyor configuration YAML.
Tweak appveyor.yml.
Tests should run now.
README.markdown: Add AppVeyor badge.