HTTP wire format

[tehmoon]

After the #30 rewrite, it could be good to add ways to read from http wire format instead of just the body.

• in http-server, add a --wire flag that will send everything to the out channel
• ~~in read, add a http-req scheme that will read from http wire format and create the request~~
• in http, add a --wire flag that will read requests from the in channel and execute it

It is easily possible I think with https://godoc.org/net/http#Request.Write and https://godoc.org/net/http#ReadRequest