Build tinymce.js.gz using grunt.

props azaozz.
see #25159.

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git-svn-id: http://core.svn.wordpress.org/trunk@25160 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove wp-tinymce.js.gz from develop.svn, as this is now part of the build process.

see #25159 and [25188].

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git-svn-id: http://core.svn.wordpress.org/trunk@25161 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Be less verbose when erroring out in do_feed() for an invalid feed template. fixes #24874.

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git-svn-id: http://core.svn.wordpress.org/trunk@25162 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Hide 'Database Upgrade Required' on admin/network/upgrade.php when you are not being asked to upgrade, to prevent confusion.

props duck_.
see #24845. see #23540.

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git-svn-id: http://core.svn.wordpress.org/trunk@25163 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix 'html5' theme support.
 * Require it to have a second argument when adding.
 * Merge, rather than replace, on second add.
 * Make current_theme_supports() work when two arguments are passed.

Adds unit tests.

props nathanrice for initial patch.
see #24932 for trunk.

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git-svn-id: http://core.svn.wordpress.org/trunk@25165 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove display of 'Previously restored by' in the revisions meta box as it is busted.

Fixes invalid markup (missing closing ul tag) when there was no previously restored revision.

see #25051 for trunk.

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git-svn-id: http://core.svn.wordpress.org/trunk@25166 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Nav menus: Allow assigning a new menu to an existing location when no theme setting is currently saved.

props ocean90.
see #25064, for trunk.

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git-svn-id: http://core.svn.wordpress.org/trunk@25167 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use get_nav_menu_locations() in wp_delete_nav_menu().

props nofearinc.
see #25064.

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git-svn-id: http://core.svn.wordpress.org/trunk@25168 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Case insensitivity for is_email_address_unsafe().

props jkudish.
fixes #25046.

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git-svn-id: http://core.svn.wordpress.org/trunk@25169 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Update tests/README.txt to reflect the new tests directory structure. props jdgrimes. fixes #25133.
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