Use valid css class names when pygments language contains invalid chars, eg html+jango
Added a link to the list of all tz database time zones
Prevent users from selecting non-helpful code
Clean up Quick-start Instructions

Now lines can be copy-pasted as is into a terminal
Move `user-select` CSS to more specific selector
Add script/cibuild.
Merge pull request #1912 from jekyll/cibuild
Update history to reflect merge of #1912 [ci skip]
Excludes should be relative to the site source
Ensure leading slashes in path matching.
Add tests for new exclude behaviour.
Cast to string before duplicating.
Merge pull request #1883 from pathawks/master
Update history to reflect merge of #1883 [ci skip]
Add jekyll-compass to the list of plugins
Move #glob_include? from core_ext to entry_filter
Use 'Forwardable' module to pass along some attribute calls to @post
Merge pull request #1927 from jekyll/delegate-silly
Update history to reflect merge of #1927
Merge pull request #1923 from mscharley/master