* xmpp/rudel-xmpp-sasl.el
  (rudel-xmpp-state-sasl-start::rudel-enter): added documentation
  string; cosmetic changes
  (rudel-xmpp-state-sasl-try-one::rudel-enter): added documentation
  string
  (rudel-xmpp-state-sasl-mechanism-step::rudel-enter): added
  documentation string
  (rudel-xmpp-state-sasl-mechanism-step::rudel-accept): added
  documentation string; added some comments
  (rudel-xmpp-sasl-states): new variable; list of states used by the
  SASL implementation; states are added to `rudel-xmpp-states'