add request line callback
Add :multipart-callback to make-parser.
can parsy only part of data buffer
merge conflicts
Merge pull request #3 from deadtrickster/parse-buffer-part

Parse only part of data buffer
Export ll-multipart-parser-state.
rename request-line callback to first-line
call :first-line callback when response reasone phrase read
Merge branch 'request-line-callback' of git://github.com/deadtrickster/fast-http into deadtrickster-request-line-callback
Merge branch 'deadtrickster-request-line-callback'
Merge branch 'master' of github.com:fukamachi/fast-http
(refs #5) Add *body-buffer-limit* to limit the memory usage.
Let fast-http-error get thorough the handler-case in callback-notify and callback-data.
(refs #5) Rename *body-buffer-limit* -> *request-body-limit*.
Add with-bench.
Optimize a little bit.
Replace fast-http.subseqs by xsubseq.
Delete with-bench.
Fix failed tests.
Raise BODY-BUFFER-EXCEEDED if content-length is larger than *request-body-limit*.