add test for broken markdown regexp
force markdown regexp to match the full extension
jekyll build/serve -q option to docs
Expand the description for the `-q` option.
Merge pull request #3147 from blbradley/markdown-file-ext-regexp
Update history to reflect merge of #3147 [ci skip]
Merge pull request #3149 from jekyll/document-build-serve-quiet-option
Update history to reflect merge of #3149 [ci skip]
fix jsonify filter when used with boolean values
Compress SCSS when pushing to jekyllrb.com.

Fixes #3153.
Rel: #3145.
Since d26202936ebe0d14bcacc5dea9c40a1b4bb830f3.
Merge pull request #3154 from afeld/jsonify-bool
Update history to reflect merge of #3154 [ci skip]
Add appveyor configuration YAML.
Tweak appveyor.yml.
Tests should run now.
README.markdown: Add AppVeyor badge.