rubycas#42: HTTPSeeOther is the only valid response that should be re…

…turned from the server on successful login

lib/casclient/responses.rb

@@ -191,7 +191,7 @@ def parse_http_response(http_response)
         @ticket = $~[1]
       end
 
-      if not ((http_response.kind_of?(Net::HTTPSuccess) || http_response.kind_of?(Net::HTTPFound)) && @ticket.present?)
+      unless http_response.kind_of?(Net::HTTPSeeOther) && @ticket.present?
         @failure = true
         # Try to extract the error message -- this only works with RubyCAS-Server.
         # For other servers we just return the entire response body (i.e. the whole error page).