Pascal Birchler 9ea68bc533 Script Loader: Add Etag: $wp_version header in load-scripts.php and load-styles.php. ...

This improves performance since browsers won't re-download the scripts and styles when there was no change in `$wp_version`.

Props sergej.mueller, dd32, swissspidy.
Fixes #28722.
Built from https://develop.svn.wordpress.org/trunk@36312


git-svn-id: http://core.svn.wordpress.org/trunk@36279 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2016-01-15 10:23:25 +00:00

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