Added the underscore node_module.

node_modules/underscore/amd/first.js

@@ -0,0 +1,13 @@
+define(['./initial'], function (initial) {
+
+  // Get the first element of an array. Passing **n** will return the first N
+  // values in the array. The **guard** check allows it to work with `_.map`.
+  function first(array, n, guard) {
+    if (array == null || array.length < 1) return n == null || guard ? void 0 : [];
+    if (n == null || guard) return array[0];
+    return initial(array, array.length - n);
+  }
+
+  return first;
+
+});