- short writes could force the server into a busy loop (i.e. basically a DOS attack)
- fix handling of trailing crlf when reading input with a length parameter
- fix handling of wsgi apps not consuming the whole input.
- make readline work with chunked input
- respect size parameter to readline method even if this isn't strictly required by the WSGI spec.

--HG--
extra : transplant_source : W%F8%B8y%C5_%83%C2%8B%1C%A6Ntn%8Bj%3F%29%86%04