Add isDeep flag to cloneBuffer.

lodash.js

@@ -3715,9 +3715,13 @@
      *
      * @private
      * @param {Buffer} buffer The buffer to clone.
+     * @param {boolean} [isDeep] Specify a deep clone.
      * @returns {Buffer} Returns the cloned buffer.
      */
-    function cloneBuffer(buffer) {
+    function cloneBuffer(buffer, isDeep) {
+      if (!isDeep) {
+        return buffer.slice();
+      }
       var Ctor = buffer.constructor,
           result = new Ctor(buffer.length);