rename group add user and add global for develop

http.go

@@ -564,7 +564,7 @@ func HttpHandleGroupDelete(response http.ResponseWriter, request *http.Request)
 	response.WriteHeader(http.StatusAccepted)
 }
 
-func HttpHandleGroupAddUser(response http.ResponseWriter, request *http.Request) {
+func HttpHandleGroupAddUsers(response http.ResponseWriter, request *http.Request) {
 	if !isMethodAllowed(&response, request) {
 		return
 	}