Allow for plugin translations to be loaded from WP_LANG_DIR/plugins/$domain-$locale.mo.

props dimadin.
see #18200.


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git-svn-id: http://core.svn.wordpress.org/trunk@25045 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: change IDs to classes in markup and CSS selectors. Props obenland, see #24858.
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Twenty Fourteen: don't allow line-wrapping in the top-level navigation menu items. Props georgestephanis, fixes #24917.
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Twenty Fourteen: remove `masthead-fixed` class after window returns to top. Props cainm, fixes #25026.
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Twenty Fourteen: ensure toolbar doesn't have a gap at the top when you start scrolling, including back compat for 3.6. Props MikeHansenMe and SergeyBiryukov, fixes #24914.
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Twenty Fourteen: Focus search box on search menu click, props kovshenin for original patch. Fixes #24895.
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Twenty Fourteen: change to just one footer widget area and use Masonry JS to display the widgets in columns. Props Frank Klein, closes #24874.
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git-svn-id: http://core.svn.wordpress.org/trunk@25051 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: accessibility changes to fix the color contrast ratio in link text and a few other places (notably hovers and focus outlines). Props sabreuse, see #25054.
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Twenty Fourteen: accessibility changes to add focus styles to match the hover style on tag links. Props sabreuse, see #25054.
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Twenty Fourteen: load Genericons correctly, and add comments to other CSS enqueue calls. Props obenland, fixes #25085.
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git-svn-id: http://core.svn.wordpress.org/trunk@25054 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add a filter on the Plugin and Theme installers table listing API args, this allows for plugins to hook in and add custom args to plugins_api() and themes_api() for the Plugin/Theme listing tabls. Fixes #18169

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Add a note that the FTP Password will not be stored on the server to the FTP credentials page. Fixes #16492

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