Obfuscated fonts using Adobe algorithm should not require UUID in dc:identifier

[danielweck]

embeddedFontDeobfuscateAdobe()
https://github.com/readium/readium-js/blob/develop/js/epub-fetch/encryption_handler.js#L60

        function urnUuidToByteArray(id) {
            var uuidRegexp = /(urn:uuid:)?([0-9a-f]{8})-([0-9a-f]{4})-([0-9a-f]{4})-([0-9a-f]{4})-([0-9a-f]{12})/i;
            var matchResults = uuidRegexp.exec(id);
            var rawUuid = matchResults[2] + matchResults[3] + matchResults[4] + matchResults[5] + matchResults[6];
            if (!rawUuid || rawUuid.length != 32) {
                console.error('Bad UUID format for ID :' + id);
            }
            var byteArray = [];
            for (var i = 0; i < 16; i++) {
                var byteHex = rawUuid.substr(i * 2, 2);
                var byteNumber = parseInt(byteHex, 16);
                byteArray.push(byteNumber);
            }
            return byteArray;
        }

@matwood