Renamed Invitation.disconnect() to end()

darcs-hash:20090515125818-58103-b92001949d2ee2dd7ea35ef4295fc4b600648262
Replaced Request.terminate() with Request.end()

darcs-hash:20090515131243-58103-a2433455f5b161d3b56e524ba2fd40229f6e9f4e