Added the underscore node_module.

node_modules/underscore/amd/pairs.js

@@ -0,0 +1,17 @@
+define(['./keys'], function (keys) {
+
+  // Convert an object into a list of `[key, value]` pairs.
+  // The opposite of `_.object` with one argument.
+  function pairs(obj) {
+    var _keys = keys(obj);
+    var length = _keys.length;
+    var pairs = Array(length);
+    for (var i = 0; i < length; i++) {
+      pairs[i] = [_keys[i], obj[_keys[i]]];
+    }
+    return pairs;
+  }
+
+  return pairs;
+
+});