Added support for Google Analytics async snippet loading (#921)
Added support for Google Analytics async snippet loading (#921)

Snippet from Google: https://developers.google.com/analytics/devguides/collection/analyticsjs/#alternative_async_tracking_snippet

Recommended by HTML5Boilerplate:
https://github.com/h5bp/html5-boilerplate/blob/master/dist/index.html
squidfunk/mkdocs-material,squidfunk/mkdocs-material,squidfunk/mkdocs-material,squidfunk/mkdocs-material