Improve the efficiency of Clack.Handler.Wookie. Use wookie:send-response for a non-delayed response.
Make handle-normal-response in Clack.Handler.Wookie an individual function.
Don't iterate if the body is a list of one element.
Fix an error of clackup when :use-default-middlewares is specified.
Host header would be a symbol because of http-parse's bug.

This workaround can be reverted after this pull request is merged.
https://github.com/orthecreedence/http-parse/pull/11
Release v0.9.6

* Made Wookie handler more efficient.