xF2 Add-on [AddonsLab] Guest Posting for XenForo 2.x 1.8.0

This update fixes compatibility with XenForo 2.2.x. Please note, that XenForo 2.2.x includes a feature called "Writing before registration", which in essence replaces the functionality of this add-on. The add-on will automatically de-activate if you activate this XenForo feature, but you can decide to keep using our add-on, as it provides more features than the built-in solution for now.

This is a bug-fix release that fixes the issues introduced in version 1.7.0 which had a faulty ZIP package.