File with parentheses in the name should not be encoded during signing

When signing a url using Knox.signedUrl(fileName, expires), a file name with parentheses has the parentheses encoded as %28 "(" and %29 ")" and produces a file name that doesn't work. If the parentheses encoding is replaced with the original parentheses, url then works.

Start at the implementation of Knox.signedUrl(fileName, expires) and trace how the file name is encoded during signing. Verify the resulting URL preserves parentheses instead of converting them to %28 and %29, and confirm that the signed URL works for such a file name.

Written by the indexing model from the issue text.