Changes with nginx 1.3.11 10 Jan 2013

*) Bugfix: a segmentation fault might occur if logging was used; the bug
had appeared in 1.3.10.

*) Bugfix: the "proxy_pass" directive did not work with IP addresses
without port specified; the bug had appeared in 1.3.10.

*) Bugfix: a segmentation fault occurred on start or during
reconfiguration if the "keepalive" directive was specified more than
once in a single upstream block.

*) Bugfix: parameter "default" of the "geo" directive did not set
default value for IPv6 addresses.