added whole system from ola4doc

sys/node_modules/es5-ext/math/log2/implement.js

@@ -0,0 +1,6 @@
+'use strict';
+
+if (!require('./is-implemented')()) {
+	Object.defineProperty(Math, 'log2', { value: require('./shim'),
+		configurable: true, enumerable: false, writable: true });
+}

sys/node_modules/es5-ext/math/log2/index.js

@@ -0,0 +1,5 @@
+'use strict';
+
+module.exports = require('./is-implemented')()
+	? Math.log2
+	: require('./shim');

sys/node_modules/es5-ext/math/log2/is-implemented.js

@@ -0,0 +1,7 @@
+'use strict';
+
+module.exports = function () {
+	var log2 = Math.log2;
+	if (typeof log2 !== 'function') return false;
+	return log2(3).toFixed(15) === '1.584962500721156';
+};

sys/node_modules/es5-ext/math/log2/shim.js

@@ -0,0 +1,14 @@
+'use strict';
+
+var log = Math.log, LOG2E = Math.LOG2E;
+
+module.exports = function (x) {
+	if (isNaN(x)) return NaN;
+	x = Number(x);
+	if (x < 0) return NaN;
+	if (x === 0) return -Infinity;
+	if (x === 1) return 0;
+	if (x === Infinity) return Infinity;
+
+	return log(x) * LOG2E;
+};