jshint/jshint — pull request #382 by fmate14 (2011-12-14 15:17:02+00:00)
Title: Do not allow to duplicate a setter.

Currently is doesn't trigger an error:

```javascript
var doubleSetter = {
get x() { return _x; },
set x(value) { _x = value; },
name: 'jshint',
set x(value) { _x = value; }
};
```

This push request is only a trivial patch and some unit tests to catch errors like this.