Background Updates: Avoid a PHP warning during theme update checks when there are multiple theme directories registered. Fixes #27815

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Bump Akismet external in trunk (3.9-RC2) to 3.0.0.


git-svn-id: http://core.svn.wordpress.org/trunk@27969 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Cast wp_count_attachments() before iterating it to avoid a notice when items exist without a mime type.

props bobbingwide.
fixes #27802.

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Add missing string translation in widgets.

see #27453, #27112.

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Theme Installer: Fixes for browsers without pushState.

props gcorne.
see #27055.

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TinyMCE: fix icons in IE7, fixes #27829
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Widgets: Remove create_function() from the customizer class.

props westonruter.
fixes #27805.

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Graceful failures for TinyMCE views of video/audio playlists.

props gcorne.
fixes #27821.

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Translate a string added in 3.7.1 but never translated previously.

props SergeyBiryukov.
fixes #27819.

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About page: Use a better preposition to describe drag-and-drop.

see #27713.

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Theme Installer: Properly call router navigation.

props gcorne.
see #27055.

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