Added the underscore node_module.

node_modules/underscore/amd/isFunction.js

@@ -0,0 +1,18 @@
+define(['./_tagTester', './_setup'], function (_tagTester, _setup) {
+
+  var isFunction = _tagTester('Function');
+
+  // Optimize `isFunction` if appropriate. Work around some `typeof` bugs in old
+  // v8, IE 11 (#1621), Safari 8 (#1929), and PhantomJS (#2236).
+  var nodelist = _setup.root.document && _setup.root.document.childNodes;
+  if (typeof /./ != 'function' && typeof Int8Array != 'object' && typeof nodelist != 'function') {
+    isFunction = function(obj) {
+      return typeof obj == 'function' || false;
+    };
+  }
+
+  var isFunction$1 = isFunction;
+
+  return isFunction$1;
+
+});