WebLogs: use ISO 8601 date format.

Squashed commit of the following:

commit 86ccca9ac6a8b42005003884f61ec1c0d799436b
Author: Mikaela Suomalainen <mikaela.suomalainen@outlook.com>
Date:   Fri May 30 15:36:32 2014 +0300

    WebLogs: Use `-` as separator instead of `/`. See ISO 8601.

commit d8b37954a36bc468c82832acaf7f13dc3f1b8c79
Author: Mikaela Suomalainen <mikaela.suomalainen@outlook.com>
Date:   Fri May 30 15:34:48 2014 +0300

    fix f10bbbed3e6fd6b110381e7430e94034646257eb

commit f10bbbed3e6fd6b110381e7430e94034646257eb
Author: Mikaela Suomalainen <mikaela.suomalainen@outlook.com>
Date:   Fri May 30 15:29:39 2014 +0300

    WebLogs: use ISO 8601 for showing date.
Merge pull request #190 from Mkaysi/weblogs

WebLogs: use ISO 8601 date format.
WebStats: fix ISO 8601 time.

It seems that I confused `%Z` with `%z` and the latter makes more sense as it shows the offset to UTC. See also ProgVal/Limnoria#701 .
Merge pull request #192 from Mkaysi/patch-2

WebStats: fix ISO 8601 time.
WebStats: Add @refresh and make channel name case-insensitive.