Allow 'slug' param of `get_terms()` to accept an array.

Props jfarthing84, dlh.
Fixes #23636.
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Twenty Fifteen: squeeze a few more bytes from screenshot PNG file. See #30133.
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Twenty Fifteen: escape variable in HTML attribute output in customer header. See #30133.
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Twenty Fifteen: spacing and code style cleanup. See #30133.
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Twenty Fifteen: consistent line endings and SVN properties on all files. See #30133.
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Twenty Fifteen: pinking shears. See #30133.
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Twenty Fifteen: minor code style for variable within array notation. See #30133.
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Twenty Fifteen: minor CSS spacing fix. See #30133.
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Ignore any local WP Cli config files.

Fixes #30134 props danielbachhuber

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Twenty Fifteen: minor CSS fixes. See #30133.
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Introduce `orderby=include` support for `get_terms()`.

Props wpsmith.
Fixes #23261.
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Make the Twenty Fifteen search form submit button screen reader accessible rather than hidden to all users. Fixes #30110. Props mattweibe, rianrietveld.
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Add a missing Oxford comma to the install screen. Fixes #30107. Props Ankit K Gupta.
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Add `wp_json_encode()`, a wrapper for `json_encode()` that ensures everything is converted to UTF-8.

Change all core calls from `json_encode()` to `wp_json_encode()`.

Fixes #28786.


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Remove UNIQUE key from 'slug' column of terms table.

Each slug is a unique and beautiful snowflake, but let's enforce that
uniqueness elsewhere.

Props hotchkissconsulting.
Fixes #22023.
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Update the root svn:ignore property to match .gitignores. Fixes #30134.

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Fix a PHPDoc typo for `wp_json_encode()`.

Props JustinSainton.

See #28786.

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Update grunt-contrib-imagemin to 0.9.1

Upstream changes https://github.com/gruntjs/grunt-contrib-imagemin/compare/v0.4.1...v0.9.1

see #30141


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Update grunt-contrib-compress to 0.12.0

Upstream changes https://github.com/gruntjs/grunt-contrib-compress/compare/f0762ba6e265ec768e65af07fc96512bd8798080...v0.12.0

see #30141


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Update grunt-sass to 0.16.0

Upstream changes https://github.com/sindresorhus/grunt-sass/compare/v0.14.0...v0.16.0

see #30141


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