Changes with nginx 0.3.39 17 Apr 2006

*) Feature: the "uninitialized_variable_warn" directive; the logging level of the "uninitialized variable" message was lowered from "alert" to "warn".

*) Feature: the "override_charset" directive.

*) Change: now if the unknown variable is used in the "echo" and "if expr='$name'" SSI-commands, then the "unknown variable" message is not logged.

*) Bugfix: the active connection counter increased on the exceeding of the connection limit specified by the "worker_connections" directive; bug appeared in 0.2.0.

*) Bugfix: the limit rate might not work on some condition; bug appeared in 0.3.38.