Twenty Fifteen: add print styles.

Props iamtakashi, closes #29967


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Update jQuery UI to 1.11.2.

Changelog: http://jqueryui.com/changelog/1.11.2/

see #29833.
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git-svn-id: http://core.svn.wordpress.org/trunk@29672 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: correct margin for pagination.

Props kwight; fixes #29964.


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Twenty Fifteen: indented nested lists in comments.

Props pauldewouters, iamtakashi, fixes #29981.


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git-svn-id: http://core.svn.wordpress.org/trunk@29674 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Introduce nested query support to WP_Date_Query.

This enhancement makes it possible to filter post, comment, and other queries
by date in ways that are arbitrarily complex, using mixed AND and OR relations.

Includes unit tests for the new syntax. In a few places, the existing unit
tests were slightly too strict (such as when checking the exact syntax of a SQL
string); these existing tests have been narrowed.

Props boonebgorges.
Fixes #29822.
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Themes: Make it possible to delete broken themes.

props ideag, obenland.
fixes #28165.
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