Append querystring to redirects

[ofhouse]

Changes

• Appends the original querystring to redirects
• Cache-Control header is set to public, max-age=0, must-revalidate for redirect responses
• Content-Type for redirects is now text/plain
• Adds response body to redirects, e.g. Redirecting to /newplacetwo/some/path?foo=xxx (308)

Fixes #296.