make XMLRPC::FaultException have a #message, otherwise the thrown exception

is useless in functional test backtraces


git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1093 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionwebservice/lib/action_web_service/protocol/xmlrpc_protocol.rb

 require 'xmlrpc/marshal'
 
+class XMLRPC::FaultException
+  alias :message :faultString
+end
+
 module ActionWebService # :nodoc:
   module Protocol # :nodoc:
     module XmlRpc # :nodoc: