Added the underscore node_module.

node_modules/underscore/modules/each.js

@@ -0,0 +1,23 @@
+import optimizeCb from './_optimizeCb.js';
+import isArrayLike from './_isArrayLike.js';
+import keys from './keys.js';
+
+// The cornerstone for collection functions, an `each`
+// implementation, aka `forEach`.
+// Handles raw objects in addition to array-likes. Treats all
+// sparse array-likes as if they were dense.
+export default function each(obj, iteratee, context) {
+  iteratee = optimizeCb(iteratee, context);
+  var i, length;
+  if (isArrayLike(obj)) {
+    for (i = 0, length = obj.length; i < length; i++) {
+      iteratee(obj[i], i, obj);
+    }
+  } else {
+    var _keys = keys(obj);
+    for (i = 0, length = _keys.length; i < length; i++) {
+      iteratee(obj[_keys[i]], _keys[i], obj);
+    }
+  }
+  return obj;
+}