Turn off addthis address bar tracking
Allow a more flexible title for SEO purposes

Pages can now have a title in the form of "title | Site"
A fulltitle in the form of "title"
Or not specify a title and get the site title "site.title"
Add description and keywords to jekyll post for SEO
Optimize site-wide title and description for SEO
Use preview config only to override variables, not as an entire config replacement