v1.4.2

Changes in this release:

• Reinstated support for Internet Explorer 11.
• Consistent canonicals.
• Exclude version.json from sitemap.
• Latest Schema.org microdata changes.
• Fix layout overflow at smallest sizes.
• Remove unused font from CSS.
• Add missing comment error styling.
• A few minor visual/interaction CSS tweaks.
• Add some additonal JSON-LD to blog article.
• Serve design pattern assets locally.