Print the "data" attribute of errors when they are fatal
Ignore "#some-anchor" from queryString on neko HttpRequest
Clean up of request.post and request.postString

Also use "multipart/form-data" content-type header as the sign
we need to call parseMultipart(), rather than doing it just
because we have an empty post string
Clean up of client headers, make sure duplicate headers are split by ","
Fix to request.authorization on neko
Fix to request.cookies on PHP