ensure apidoc works with relative paths
add guidePrefix option for apidoc
Update README.md
Allow customizing GuideRenderer::guideUrl.
Allow customizing GuideRenderer::apiUrl [skip ci]
use css class to indicate broken links in generated guide/api docs. [skip ci]
fixed apidoc wrong property definedBy

fixes #5899
apidoc minor fixes: phpdoc, use statements, comments
Fixed phpdoc
doc fix [skip ci]
prepare for 2.0.1 release
prepare for next release.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	templates/bootstrap/layouts/main.php