Upgrade from 0.4 to 0.6.

<ChangeLog>

*) Bugfix: the main process died when the "type" application option

contained version; the bug had appeared in 0.5.

*) Change: the "workers" application option was removed, the "processes"

application option should be used instead.

*) Feature: the "processes" application option with prefork and dynamic

process management support.

*) Feature: Perl application module.

*) Bugfix: in reading client request body; the bug had appeared in 0.3.

*) Bugfix: some Python applications might not work due to missing

"wsgi.errors" environ variable.

*) Bugfix: HTTP chunked responses might be encoded incorrectly on 32-bit

platforms.

*) Bugfix: infinite looping in HTTP parser.

*) Bugfix: segmentation fault in router.

</ChangeLog>