Twenty Fourteen: change hardcoded pagination base to use the WordPress Rewrite object's `pagination_base` value instead. Document global variable usage properly.

Props SergeyBiryukov, fixes #28405.
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Plugin activation/deletion errors should be styled as such.

props johnbillion.
fixes #28260.
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Capitalize 'ID' correctly to avoid random failures of Tests_Tax_Query::test_term_taxonomy_id_field_no_taxonomy().

see #25284.
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git-svn-id: http://core.svn.wordpress.org/trunk@28465 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix typo in mbstring_binary_safe_encoding() description.

props ghost1227.
fixes #28423.
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In `WPPlaylistView::ended()`, at the end of a playlist, set the index to `0` and call `->setCurrent()` instead of `->loadCurrent()` so that the first track is properly highlighted.

Fixes #28428.

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git-svn-id: http://core.svn.wordpress.org/trunk@28467 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In the spirit of [27622], add a few CSS rules to ensure that videos will be responsive, regardless of theme.

Props Funkatronic.
Fixes #28414.

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Add oEmbed support for TED talks.

props pdclark.
fixes #28285.
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git-svn-id: http://core.svn.wordpress.org/trunk@28469 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Because of YouTube's overwhelming dominance in the online video space, we should help our users who paste bad URLs when possible. It is easy to fix `http://youtube.com/embed/acb1233` URLs by turning them into `http://youtube.com/watch?v=abc1233` embeds using an embed handler (we already have one to fix Google Video embeds).

We should avoid doing this in almost every other case, but it's YouTube, and it's an easy error for a novice to make.

Fixes #24660.

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Make sure `$post` is properly documented as optional where applicable.

See #28388.

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Ensure `$post_id` is documented as optional where applicable.

See #28388.

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Be more specific that `$post_id` does not default to the ID of the global `$post` in some cases.

See [28654]. See #28388.

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Merge branch 'master' into lazy_query_16910