Remove the newlines before doing a Regex check inside the decodeDataUrl method in the same way that is the isBase64 method doing.

Some base64 encoded images contains newlines, passing them directly to the Image::make method can result in a NotReadableException.

Here are the tests I did before this commit :

• data part only => OK
• data:[..] header + data part => OK
• data part only with newlines => OK
• data:[..] header + data part with newlines => Failure