Quentin Brandon af69eddd1c Add optional timezoneOffset config for appenders
Example:
    log4js.configure({
        appenders: [{type: 'console', timezoneOffset: -540}],
        replaceConsole: true
    });

The expected value is the equivalent of (new Date).getTimezoneOffset()
In this example, -540 is the value for JST.
This allows machines members of world-wide-spread cluster to all report
log time-stamps using the same timezone (or adapt the timezone to a
local different from the system)
2015-03-20 11:51:23 +09:00
..
2014-12-01 12:29:45 +01:00
2014-07-12 15:11:21 +10:00
2014-08-18 07:32:23 +08:00
2014-09-10 13:03:21 -03:00