* obby/rudel-obby-server.el (header): better documentation
  (require rudel-state-machine): now required for state machine style
  handling of client connections
  (require rudel-obby-state): now required; provides base class for
  states
  (rudel-obby-server-state-new): new class; client connection state
  new
  (rudel-obby-server-state-encryption-negotiate): new class; client
  connection state for negotiating encryption
  (rudel-obby-server-state-before-join): new class; client connection
  state for waiting for login request
  (rudel-obby-server-state-new): new class; client connection state
  entered after session setup and joining is complete
  (rudel-obby-server-connection-states): new variable; list of states
  and their symbolic names
  (rudel-obby-client): now derived from rudel-state-machine
closes: #18