#114 Upgrade install causes infinite redirect loop

[Craig Andera]

When upgrading to build 1.8.0.1677, if a site is
configured to use ASP.NET authentication, an infinite
redirect loop can occur between the configuration
updater page and the login page.

Workaround: disable authentication while doing the
update by adding

<allow users="*" />

to the web.config file. Be sure remove it once the
upgrade is complete.