Support multipart PUT requests

[bpfoster]

It would appear there's nothing in the specs that restricts multipart requests to only POST.

In fact the documentation for the Netty HttpPostRequestDecoder (used by finatra for multipart parsing) states it "will decode Body and can handle POST BODY (or for PUT, PATCH or OPTIONS)." [1]

Given that, should finatra check for multipart bodies in all those methods?

[1] http://netty.io/4.0/api/io/netty/handler/codec/http/multipart/package-summary.html

[cacoco]

This was added in ec94853. Let me know if that does not solve your use case.