Breaks normal usage of setTitleColor

- Install the category via CocoaPods
- Open a ViewController
- Add a button
- Set the outlet
- Change color in `viewDidLoad` 

``` objc
[self.superAwesomeButton setTitleColor:[UIColor greenColor] forState:UIControlStateHighlighted];
```

Sample project:
https://github.com/uzegonemad/hyperoslo-form-uibutton-issues
