added whole system from ola4doc

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

@@ -0,0 +1,17 @@
+'use strict';
+
+var exp = Math.exp;
+
+module.exports = function (x) {
+	var a, b;
+	if (isNaN(x)) return NaN;
+	x = Number(x);
+	if (x === 0) return x;
+	if (x === Infinity) return 1;
+	if (x === -Infinity) return -1;
+	a = exp(x);
+	if (a === Infinity) return 1;
+	b = exp(-x);
+	if (b === Infinity) return -1;
+	return (a - b) / (a + b);
+};