Add jshintrc to qunit.

props jorbin.
see #25187.

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Inline documentation for hooks in wp-admin/nav-menus.php.

Props pauldewouters for the intial patch.
Fixes #25528.

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Inline documentation for hooks in wp-admin/network/edit.php and wp-admin/network/users.php.

Props aralbald for the initial patch.
Fixes #25728.

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Twenty Fourteen: JavaScript fixes after running jshint, see r25960:

 * Enforce `===` instead of `==`
 * Fix confusing use of `!`
 * Remove unused variables like `calcNext`, defined but never used
 * Proper use of braces
 * Move functions out of if/else statements
 * Document unknown functions as Microsoft-specific
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Explicitly globalize $is_nginx in vars.php.

props johnjamesjacoby.
fixes #25776.

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Correct $user_id parameter description. props mauryaratan, Corphi. fixes #25774.
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Twenty Fourteen: second pass at revamping the main CSS file. Update pattern graphics to fix issue with orientation changes on tablets. Props iamtakashi, fixes #25592.
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