Introduced `dayofweek_iso` time param for `WP_Date_Query`.

The initial `dayofweek` param sets day 1 to Sunday. This is out of step with
ISO standards, which calls Monday day 1. To maintain backward compatibility
with the existing parameter, we introduce the new `dayofweek_iso` for the
new, more compliant param.

Props mboynes.
Fixes #28063.
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Twenty Fourteen: Make featured content in Customizer contextual to the front page.

Props celloexpressions, fixes #29578.

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git-svn-id: http://core.svn.wordpress.org/trunk@30143 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Improve default argument formatting in `WP_Date_Query::__construct()`.
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git-svn-id: http://core.svn.wordpress.org/trunk@30144 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Ten and Eleven: don't display modified excerpt link in wp-admin.

Props kraftbj, fixes #30026.

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git-svn-id: http://core.svn.wordpress.org/trunk@30145 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: fix keyboard focus on Appearance > Header view.

Props florianziegler, fixes #29787.

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git-svn-id: http://core.svn.wordpress.org/trunk@30146 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: update table styles in editor CSS file for new TinyMCE class names.

Props slobodanmanic, fixes #28703.

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git-svn-id: http://core.svn.wordpress.org/trunk@30147 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Clean up 'post-thumbnail' theme support unit tests.

* Separate into smaller test methods.
* Remove incorrect tests. A number of assertions in the existing test have always incorrectly described the behavior of `current_theme_supports( 'post-thumbnails' )`, but no one ever noticed because the tests had been designed to bail when `_wp_render_title_tag()` did not exist. The failures finally became visible when that function was introduced in [30074].

See #18548.
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