* Cache css with version in url. This makes most js and css requests to
be cached by the browser
* Force caching previews, the etag is in the url so that if the propfind
gives a new etag, we will refresh it otherwise it's no use to try to
fetch the new etag and do tons of DB queries
Tested with firefox and 'debug' => false (important so that the js/css
urls are generated with ?v= parameter)
Signed-off-by: Carl Schwan <carl@carlschwan.eu>
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