added KF event extra field

inMsg.go

@@ -78,6 +78,8 @@ type EventMsg struct {
 	Latitude  float64 //for LOCATION
 	Longitude float64 //for LOCATION
 	Precision float64 //for LOCATION
+	KfAccount string  //for kf_close_session kf_create_session
+	CloseType string  // kf_close_session
 }
 
 //ReadCommonHeader parse xml of common field of wechat post message