added whole system from ola4doc

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

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

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

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

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

@@ -0,0 +1,7 @@
+'use strict';
+
+module.exports = function () {
+	var sign = Math.sign;
+	if (typeof sign !== 'function') return false;
+	return ((sign(10) === 1) && (sign(-20) === -1));
+};

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;
+};