Enhancements
* Extracted [Kerberos](https://github.com/sdelements/lets-chat-kerberos) and [LDAP](https://github.com/sdelements/lets-chat-ldap) authentication into separate plugins
* Added fig.yml
Fixes
* Fixed error on messages andpoint when room parameter not specified (211)
* Fixed undefined error (210)
* XMPP root now advertises itself as a server, not conference (214)