Haywire zero-copy about haywire HOT 4 CLOSED

Currently Haywire automatically free's the http_request here https://github.com/kellabyte/Haywire/blob/master/src/haywire/http_request.c#L285. It assumes that calling the users callback will be synchronous. I think we should move this to here https://github.com/kellabyte/Haywire/blob/master/src/haywire/http_server.c#L293 so that the user can spawn a thread. This would facilitate zero-copy as well.

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Haywire already has a send_response_complete() callback. See the hello world sample.

void response_complete(void* user_data)
{
    // Here we would could free http_request and hw_http_response.
    // Should make names consistent.
}

void get_root(http_request* request, hw_http_response* response, void* user_data)
{
    // ... Do a bunch of stuff...

    // This could also free http_request.
    hw_http_response_send(response, "user_data", response_complete);
}

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I think the current haywire free's buffers at the wrong spot. It free's them after parsing/calling the callback when it should do it after the response is sent.

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Fixed by #103

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