Close a connection when HTTP/1.0.
Fix bugs for Clack v1.0.

* URL decode :path-info
* add :content-type and :content-length to ENV.
Reset body-buffer of HTTP parser in :finish-callback.
Replace fast-write-sequence by fast-write-byte in :body-callback.
Optimize handle-request and parse-host-header.
Tweak handle-normal-response a little bit.
Merge branch 'master' of github.com:fukamachi/woo
Update benchmarking result.