Twenty Fifteen: Add Foursquare icon support to the social link menu. 

props iamtakashi.
fixes #30100.
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git-svn-id: http://core.svn.wordpress.org/trunk@30023 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix JSHint errors introduced in [30014].

props adamsilverstein.
see #29572.
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git-svn-id: http://core.svn.wordpress.org/trunk@30024 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: If the sidebar is taller than the viewport scroll it with the content, if it's shorter keep it fixed.

Props mattwiebe, iamtakashi, avryl, fixes #29979.


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Fix 'count' in `WP_Comment_Query` when using 'meta_query'.

Props heshiming, desaiuditd.
Fixes #23369.
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git-svn-id: http://core.svn.wordpress.org/trunk@30026 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add labels to the Personal Options input fields on the user profile editing screen. Fixes #30101. Props Ankit K Gupta
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Introduce an `edit_form_before_permalink` action which gets fired after the title field but before the permalink fields. Fixes #29691. Props captaintheme
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Optimize site query when performing network database upgrades

We only use `blog_id` from the query, so we don't need a wildcard.

props marcosf
Fixes #30097

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git-svn-id: http://core.svn.wordpress.org/trunk@30029 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `wp_link_pages()`, only output link separators between actual pagination links. Fixes #24940. Props obenland.
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git-svn-id: http://core.svn.wordpress.org/trunk@30030 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Improve `WP_Tax_Query` param sanitization for empty strings.

When an empty string is passed as one of the clauses in the `$tax_query`
parameter, it should be discarded rather than parsed as a first-order clause.

Props tmtrademark.
Fixes #30117.
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git-svn-id: http://core.svn.wordpress.org/trunk@30031 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Cast class names to an array to avoid a potential warning.

props briandichiara
fixes #29743
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Rename `_wp_password_hint()` to `_wp_get_password_hint()` to bring it inline with core terminology. Fixes #21243.
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Add a missing asterisk in the DocBlock for `write_post()`.

Also removes several `@uses` tags, which are no longer leveraged as part of the inline documentation standard.

Props tareq1988.
Fixes #30118.

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Update expected results in wp_link_pages() unit tests after [30030].

see #24940.
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git-svn-id: http://core.svn.wordpress.org/trunk@30035 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Don't add 'sticky' class in get_post_class() if 'ignore_sticky_posts' query var is set.

props jakub.tyrcha, johneckman.
fixes #18035.
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Make sure the validator list on Credits screen floats correctly with longer names.

props kosvrouvas.
fixes #30066.
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