Removed response calls to getOutputStream() since we are using getWriter().

They are mutually exclusive, and calling response.getOutputStream() after response.getWriter() results in a java.lang.IllegalStateException.

From http://docs.oracle.com/javaee/5/api/javax/servlet/ServletResponse.html:

> To send binary data in a MIME body response, use the ServletOutputStream returned by
> getOutputStream(). To send character data, use the PrintWriter object returned by
> getWriter(). To mix binary and text data, for example, to create a multipart response,
> use a ServletOutputStream and manage the character sections manually.