Fix default stylesheet link
Merge pull request #411 from nanoc/fix/stylesheet-href

Fix default stylesheet link
Add workaround for Nokogiri modifying input on JRuby
Disable pygments.rb, rdiscount and redcarpet on JRuby
Document #parse
Remove useless doc assignment
Create Piper class, for piping from/to spawned processes
Implement input handling for Piper
Wait for stdout/stderr threads to end
Use Thread#join rather than #value
Use Piper for asciidoc filter
Move gem and colorize_syntax filter tests to Piper
Remove unused foo.txt and bar.txt files
Remove remaining uses of systemu
Merge pull request #416 from nanoc/bug/nokogiri-on-jruby-frozen-content

Add workaround for Nokogiri modifying input on JRuby
Merge branch 'bug/jruby-pipes' into release-3.6.x

Conflicts:
	Gemfile.lock
Add release notes for 3.6.9 (WIP)
Bump version
Update Gemfile.lock
Merge branch 'release-3.6.x'

Conflicts:
	Gemfile.lock
	NEWS.md
	lib/nanoc/version.rb
	test/cli/commands/test_create_site.rb