Added the underscore node_module.

node_modules/underscore/cjs/isFunction.js

@@ -0,0 +1,17 @@
+var _tagTester = require('./_tagTester.js');
+var _setup = require('./_setup.js');
+
+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;
+
+module.exports = isFunction$1;