recursiveModuleCompileToSingleFile: chdir on reject

Make `process.chdir` to original dir if compilation if failed. For success result chdir revert already exists.

It need it you need to execute other scripts after traceur compilation. And if it is failed - dir should be changed to original.
Sorry, my comment was unclear. We write the function like its called:
```
}, function() {
```
no space before() one after.