added whole system from ola4doc

sys/node_modules/es5-ext/array/#/intersection.js

@@ -0,0 +1,19 @@
+'use strict';
+
+var value    = require('../../object/valid-value')
+  , contains = require('./contains')
+  , byLength = require('./_compare-by-length')
+
+  , filter = Array.prototype.filter, push = Array.prototype.push
+  , slice = Array.prototype.slice;
+
+module.exports = function (/*…list*/) {
+	var lists;
+	if (!arguments.length) slice.call(this);
+	push.apply(lists = [this], arguments);
+	lists.forEach(value);
+	lists.sort(byLength);
+	return lists.reduce(function (a, b) {
+		return filter.call(a, function (x) { return contains.call(b, x); });
+	});
+};