Added the underscore node_module.

node_modules/underscore/amd/invoke.js

@@ -0,0 +1,28 @@
+define(['./restArguments', './isFunction', './map', './_deepGet', './_toPath'], function (restArguments, isFunction, map, _deepGet, _toPath) {
+
+  // Invoke a method (with arguments) on every item in a collection.
+  var invoke = restArguments(function(obj, path, args) {
+    var contextPath, func;
+    if (isFunction(path)) {
+      func = path;
+    } else {
+      path = _toPath(path);
+      contextPath = path.slice(0, -1);
+      path = path[path.length - 1];
+    }
+    return map(obj, function(context) {
+      var method = func;
+      if (!method) {
+        if (contextPath && contextPath.length) {
+          context = _deepGet(context, contextPath);
+        }
+        if (context == null) return void 0;
+        method = context[path];
+      }
+      return method == null ? method : method.apply(context, args);
+    });
+  });
+
+  return invoke;
+
+});