Media: Swap in a new icon for the grid mode.

props melchoyce.
fixes #29353.

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Link to apps.wordpress.org instead of wordpress.org/mobile.

props pento.
fixes #29496.

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Media grid details: Load large images instead of originals, if available.

fixes #29498.

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i18n: Skip language chooser for localized packages.

Also fixes the install.php welcome string, which was not bring printed.

fixes #29487.

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Final about page for 4.0. Enjoy the videos!

props ryelle, melchoyce, smashcut, wonderboymusic, helen.
fixes #29494.

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Pinking shears.

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About: Make sure the images are properly responsive.

props ocean90.
see #29494.

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WordPress 4.0.

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Trunk is now 4.1-alpha.

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4.1 version bumps.

see [29712], #29537.
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Don't display Edit links for posts and terms in toolbar if they are empty.

props boonebgorges.
fixes #29538.
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Check for [\r\n\t ] instead of \s in sanitize_file_name() to avoid UTF-8 issues.

props p_enrique.
fixes #26094.
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Use home URL instead of example.org on Permalink Settings screen.

props voldemortensen, jesin.
fixes #29509.
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Use get_registered_nav_menus() in has_nav_menu().

props voldemortensen.
fixes #29461.
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* Declare $site_mimes before using it in check_upload_mimes().
* Use the same default value for 'upload_filetypes' as on Network Settings screen.

props rmccue.
fixes #29512 for trunk.
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Twenty Fourteen: Use correct check for the front page in Featured_Content::pre_get_posts().

props kwight.
fixes #29550.
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Remove 'WordPress Language' reference from wp-config-sample.php.

props voldemortensen.
see [29630]. fixes #29562.
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Use https for apps.wordpress.org links.

props pento.
fixes #29595 for trunk.
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Add 'Unattached' filter for galleries.

props pento.
fixes #29329.
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Don't display Edit links for attachments user cannot edit.

props skaeser.
fixes #29596 for trunk.
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