Updating existing JDK code to use InputStream.transferTo()

[Pavel Rappo]

> So then our transferTo() implementation should be like this?
> 
> while ((read = this.read(buffer, 0, TRANSFER_BUFFER_SIZE)) > -1) {

Isn't it the same as we have now? :) If you mean "> 0", then we should probably
wait for someone with both IO and NIO expertise to have a look at this.