added whole system from ola4doc

sys/node_modules/es5-ext/string/#/pad.js

@@ -0,0 +1,18 @@
+'use strict';
+
+var toInteger = require('../../number/to-integer')
+  , value     = require('../../object/valid-value')
+  , repeat    = require('./repeat')
+
+  , abs = Math.abs, max = Math.max;
+
+module.exports = function (fill/*, length*/) {
+	var self = String(value(this))
+	  , sLength = self.length
+	  , length = arguments[1];
+
+	length = isNaN(length) ? 1 : toInteger(length);
+	fill = repeat.call(String(fill), abs(length));
+	if (length >= 0) return fill.slice(0, max(0, length - sLength)) + self;
+	return self + (((sLength + length) >= 0) ? '' : fill.slice(length + sLength));
+};