added whole system from ola4doc

sys/node_modules/es5-ext/math/sign/shim.js

@@ -0,0 +1,7 @@
+'use strict';
+
+module.exports = function (value) {
+	value = Number(value);
+	if (isNaN(value) || (value === 0)) return value;
+	return (value > 0) ? 1 : -1;
+};