Merge branch 'release/v3.1.42' into develop
Adding a reference to the Shadow DOM
Update js/w3c/headers.js

Change alt-format class to rel=alternate
respec2html is a command line utility that converts a ReSpec source file to an HTML file. Depends on PhantomJS <http://phantomjs.org>. Changes:
- Poll document.respecDone for doneness.
- Use ReSpec built-in toHTMLSource() for serialization.
Update js/w3c/headers.js

Added optional language and type to alternate formats
Make timeout configurable.
Prettify variable names.
Make stringifying structured references more robust by making all but title and href optional.
Handle LCWD status.
Merge pull request #133 from anssiko/respec2html

respec2html is a command line utility that converts a ReSpec source file...
Merge pull request #145 from tobie/robuster-refs

Make the stringification of structured biblio refs more robust.
Merge pull request #144 from plinss/develop

Develop
Merge pull request #142 from shs96c/develop

Adding a reference to the Shadow DOM
v3.1.43
Merge branch 'release/v3.1.43' into gh-pages