Refactored in 0.9.33 to use Servlet 3.0 API and remove dependency
on old Jetty 5 MultiPartRequest code. See ticket 2109.
Required major changes for Jetty 6
to support change from MultiPartRequest to MultiPartFilter.
Unfortunately, Content-type not available until Jetty 8
So we could either extend and fix MultiPartFilter, and rewrite everything here,
or copy MultiPartRequest into our war and fix it so it compiles with Jetty 6.
We do the latter.
The filter would have been added in web.xml,
see that file, where it's commented out.
Filter isn't supported until Tomcat 7 (Servlet 3.0)
0.9.19 moved from susimail so it may be used by routerconsole too