added whole system from ola4doc

sys/node_modules/es5-ext/math/atanh/implement.js

@@ -0,0 +1,6 @@
+'use strict';
+
+if (!require('./is-implemented')()) {
+	Object.defineProperty(Math, 'atanh', { value: require('./shim'),
+		configurable: true, enumerable: false, writable: true });
+}

sys/node_modules/es5-ext/math/atanh/index.js

@@ -0,0 +1,5 @@
+'use strict';
+
+module.exports = require('./is-implemented')()
+	? Math.atanh
+	: require('./shim');

sys/node_modules/es5-ext/math/atanh/is-implemented.js

@@ -0,0 +1,7 @@
+'use strict';
+
+module.exports = function () {
+	var atanh = Math.atanh;
+	if (typeof atanh !== 'function') return false;
+	return atanh(0.5) === 0.5493061443340549;
+};

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

@@ -0,0 +1,14 @@
+'use strict';
+
+var log = Math.log;
+
+module.exports = function (x) {
+	if (isNaN(x)) return NaN;
+	x = Number(x);
+	if (x < -1) return NaN;
+	if (x > 1) return NaN;
+	if (x === -1) return -Infinity;
+	if (x === 1) return Infinity;
+	if (x === 0) return x;
+	return 0.5 * log((1 + x) / (1 - x));
+};