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update Font Awesome (#1711)

REF: https://github.com/FortAwesome/Font-Awesome/blob/master/CHANGELOG.md

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Include a default title_separator (#1701)

The current code prevented any separator being included when site.title_separator was unset.

Merge branch 'master' of https://github.com/mmistakes/minimal-mistakes

Update CHANGELOG and history

fix typo in seo template (#1687)

naver-site-verification to naver_site_verification

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Add Hungarian localized UI text strings

Hungarian translation of ut-text #1681 (#1682)

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DRY `categories_max` calculation in categories.html layout

DRY `tags_max` calculation in _layouts/tags.html (#1696)

It was being done twice, and it doesn't seem to need to be.

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Add `toc_sticky` to stick table of contents

"Stick" table of contents to top of the page by adding:

```
toc: true
toc_sticky: true
```

to a post or page's YAML Front Matter.
Note: only supported with `single` layout.

Add support for captioning images in feature row helper

Use `image_caption` YAML front matter to assign a caption to the feature image, Markdown is allowed.

Close #1440

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Merge branch 'master' of https://github.com/mmistakes/minimal-mistakes

Implement feature #1652 google custom search support.  (#1667)

Implement feature #1652 google custom search support. For now we only support the look and feel "results only" and the engine must be set to use that layout. Add a google section to the search providers and search_form and search layout.

Close #1652

Fix table of contents missing borders

Fixes #1675