Use 256 byte table for IsSpace.
Add sendBodyChunked test case for buggy http server.
Do not tolerate single LF in chunked ending.

As this is not suggested in the spec.
New util function: FieldsN.
Use FieldsN to parse request line and response status line.

This makes COW more tolerant with HTTP servers.
ParseRequestURIBytes which parses on []byte. Remove scheme in URL.
Update CHANGELOG.