Note that in the current version of `grunt`, the second argument to `grunt.registerTask()` should be an array of tasks, so this should something like:

```javascript
grunt.registerTask('default', [ 'jslint', 'nodeunit' ]);
```

I have merged the pull request and fixed this in  https://github.com/lupomontero/horseshoe/commit/8833d80bccfa4f540f847f48874750e1ca4ce38f#L0L37