This is a bugfix release. # Broker: * The broker no longer ignores the `auth_plugin_init()` return value. Closes bug #1215084. * Use `RTLD_GLOBAL` when opening authentication plugins on posix systems. Fixes resolving of symbols in libraries used by authentication plugins. * Add/fix some config documentation. * Fix ACLs for topics with $SYS. * Clients loaded from the persistence file on startup were not being added to the client hash, causing subtle problems when the client reconnected, including ACLs failing. This has been fixed. * Add note to mosquitto-tls man page stating that certificates need to be unique. Closes bug #1221285. * Fix incorrect retained message delivery when using wildcard subs in some circumstances. Fixes bug #1226040. # Client library * Fix support for Python 2.6, 3.0, 3.1. * Fix TLS subjectAltName verification and segfaults. * Handle EAGAIN in Python on Windows. Closes bug #1220004. * Fix compilation when using `WITH_TLS=no`. * Don't fail reconnecting in Python when broker is temporarily unavailable.