S3ManifestStaticStorage does not work with filenames with special characters

[nl-emmanuellodovice]

If you have a css file like home+profile.css and you imported this in your main styles.css like @import url("home%2Bprofile.css"), when using S3ManifestStaticStorage and running collectstatic, the storage classes creates new files with hash in the filename and updates url in the new css files to use the filenames with the hash. But it unqoutes the url so you end up with url("home+profile.css") in the css files uploaded to s3. This results to 404 when the browser tries to load home+profile.css because s3 urlencodes the object keys.