Toggle table of contents via front matter (#1310)

* Add jekyll-toc include
* Reduce whitespace generated by comments
* Add table of contents include to `single` layout
* Replace `toc` include with jekyll-toc enabled YAML Front Matter
* Update README
* Update table of contents documentation
  - Revise `toc` helper include to mention that it will be deprecated in the next major version.
  - Add documentation to `single` layout explaining how to enable table of contents on those pages.
* Update CHANGELOG and history
* Update LICENSE

Close #1222

docs/_pages/about.md

@@ -12,7 +12,8 @@ layouts_gallery:
   - url: /assets/images/mm-layout-archive.png
     image_path: /assets/images/mm-layout-archive.png
     alt: "archive layout example"
-last_modified_at: 2017-10-16T12:43:05-04:00
+last_modified_at: 2017-10-20T12:43:30-04:00
+toc: true
 ---
 
 Minimal Mistakes is a flexible two-column Jekyll theme. Perfect for hosting your personal site, blog, or portfolio on GitHub or self-hosting on your own server. As the name implies --- styling is purposely minimalistic to be enhanced and customized by you :smile:.
@@ -23,12 +24,14 @@ Minimal Mistakes is a flexible two-column Jekyll theme. Perfect for hosting your
 
 ## Notable Features
 
-- Compatible with Jekyll 3.x and GitHub Pages
-- Support for Jekyll's built-in Sass/SCSS preprocessor
-- Several responsive layout options (single, archive index, splash, and paginated home page)
-- SEO optimized with support for [Twitter Cards](https://dev.twitter.com/cards/overview) and [Open Graph](http://ogp.me/) data
+- Bundled as a "theme gem" for easier install/upgrading.
+- Compatible with GitHub Pages.
+- Support for Jekyll's built-in Sass/SCSS preprocessor.
+- Seven different skins (color variations).
+- Several responsive layout options (single, archive index, splash, and paginated home page).
+- Optimized for search engines with support for [Twitter Cards](https://dev.twitter.com/cards/overview) and [Open Graph](http://ogp.me/) data
 - Optional [header images](https://mmistakes.github.io/minimal-mistakes/docs/layouts/#headers), [custom sidebars](https://mmistakes.github.io/minimal-mistakes/docs/layouts/#sidebars), [table of contents](https://mmistakes.github.io/minimal-mistakes/docs/helpers/#table-of-contents), [galleries](https://mmistakes.github.io/minimal-mistakes/docs/helpers/#gallery), related posts, [breadcrumb links](https://mmistakes.github.io/minimal-mistakes/docs/configuration/#breadcrumb-navigation-beta), [navigation lists](https://mmistakes.github.io/minimal-mistakes/docs/helpers/#navigation-list), and more.
-- Commenting support (powered by [Disqus](https://disqus.com/), [Facebook](https://developers.facebook.com/docs/plugins/comments), Google+, [Discourse](https://www.discourse.org/), static-based via [Staticman](https://staticman.net/), and custom).
+- Commenting support (powered by [Disqus](https://disqus.com/), [Facebook](https://developers.facebook.com/docs/plugins/comments), Google+, [Discourse](https://www.discourse.org/), static-based via [Staticman v1 and v2](https://staticman.net/), and custom).
 - [Google Analytics](https://www.google.com/analytics/) support.
 - UI localized text in English (default), Brazilian Portuguese (Português brasileiro), Chinese, Danish, Dutch, French (Français), German (Deutsch), Greek, Indonesian, Italian (Italiano), Korean, Nepali (Nepalese), Polish, Russian, Spanish (Español), Swedish, Turkish (Türkçe), and Vietnamese.
 

docs/_pages/terms.md

@@ -1,11 +1,10 @@
 ---
 permalink: /terms/
 title: "Terms and Privacy Policy"
-last_modified_at: 2016-11-03T11:57:46-04:00
+last_modified_at: 2017-10-20T12:42:38-04:00
+toc: true
 ---
 
-{% include toc %}
-
 ## Privacy Policy
 
 The privacy of my visitors is extremely important. This Privacy Policy outlines the types of personal information that is received and collected and how it is used.