Twenty Fourteen: remove non-standard `::selection` selectors. Closes #25898. 
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git-svn-id: http://core.svn.wordpress.org/trunk@25985 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid JSHint errors. Use dot notation when able and declare pwsL10n as a global.

props jorbin.
fixes #25870.

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git-svn-id: http://core.svn.wordpress.org/trunk@25986 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid JSHint errors in color-picker.js. One `var`, single quotes, add missing semicolon, declare wpColorPickerL10n as global.

props jorbin.
fixes #25877.

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git-svn-id: http://core.svn.wordpress.org/trunk@25987 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid JSHint errors in admin comment.js. Declare globals, use single quotes.

props jorbin.
fixes #25885. 

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git-svn-id: http://core.svn.wordpress.org/trunk@25988 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: implement UX features in spite of being non-standard CSS selectors that won't validate. `@viewport` for a better touch experience on Windows, and `::selection` for better text selection styles. See #25888 and #25898, props celloexpressions.
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git-svn-id: http://core.svn.wordpress.org/trunk@25989 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Bundled Themes: implement Microsoft-specific `@viewport` rules for better responsive styling in Windows 8 "snapped" views. Props celloexpressions, fixes #25888.
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git-svn-id: http://core.svn.wordpress.org/trunk@25990 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: allow slider "Previous" and "Next" labels to be translated, props michahwave. Fixes #25897.
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Say hello to a fresh new look for the WordPress admin.

Still to come: more color schemes, a responsive component, and more.

see #25858.
props iammattthomas, tillkruess, EmpireOfLight, melchoyce, ryelle, joen, mitchoyoshitaka, sirbrillig, andypeatling, isaackeyet, Otto42, dd32, matt, helen.

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Add spinner images that were inadvertently left out of [26072]. see #25858.

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