fix construction of the backtrace printer..

[git-p4: depot-paths = "//depot/": change = 867]

shoutcast.py

@@ -177,7 +177,7 @@ class ShoutProxy(resource.Resource):
 		self.fetchingurls = False
 
 	def dump_exc(self):
-		exc = StringIO()
+		exc = StringIO.StringIO()
 		traceback.print_exc(file=exc)
 		exc.seek(0)
 		self.request.setHeader('content-type', 'text/html')