* OF-1370: inVerse plugin: hide registration tab.

When a user cannot register (if the domain is locked, and IBR is disabled), registration options should not be shown.

* OF-1371: Upgrade inVerse to 3.2.1

This commit replaces the converse.js 3.1.0 release with version 3.2.1. Additionally, the plugin now contains a copy of jquery (where previously, a link to a CDN was used).