Update wrench.js

Fixes a bug (not sure if has been reported).

`copyDirRecursive` calls itself from the `rmdirRecursive` callback when newDir exists. It should call itself with the original copyDirRecursive arguments, not the callback arguments. 

Also `fun.apply(thisArg, argsArray)` expects argsArray to be an array (see [here](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/apply)) but `arguments` is not an array (see [here](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions_and_function_scope/arguments))

lib/wrench.js

@@ -323,11 +323,12 @@ exports.rmdirRecursive = function rmdirRecursive(dir, failSilent, clbk){
  * Note: Directories should be passed to this function without a trailing slash.
  */
 exports.copyDirRecursive = function copyDirRecursive(srcDir, newDir, opts, clbk) {
+ var originalArguments = Array.prototype.slice.apply(arguments);
  fs.stat(newDir, function(err, newDirStat){
  if(!err) {
  if(typeof opts !== 'undefined' && typeof opts !== 'function' && opts.forceDelete)
  return exports.rmdirRecursive(newDir, function(err){
- copyDirRecursive.apply(this, arguments);
+ copyDirRecursive.apply(this, originalArguments);
  });
  else
  return clbk(new Error('You are trying to delete a directory that already exists. Specify forceDelete in an options object to override this.'));