allow $c->req->body to be a simple filehandle or a string

allow $c->req->body to be a simple filehandle or a string

Previously, it was assumed that the $c->req->body was both a filehandle
and a filename (something that was only true for File::Temp objects) and
didn't work if the request body was a plain string.  This distribution
now allows for either a filehandle or a string which is slightly different
semantics than specifically File::Temp objects (which are file handles
which string-ify to the filename)