Removing image not working

First of all: thanks for the awesome library. After fighting with the ViewPager previously this makes my life so much easier.

I've got a problem though, and couldn't find anything recent about it. I've got a `SliderLayout` with multiple images. After I click a certain button I want to remove the current image, so I've implemented the following in the onclick of my button:

```
photoSlider.removeSliderAt(photoSlider.getCurrentPosition());
photoSlider.moveNextPosition(true);
photoSlider.invalidate();
```

The photo is however not removed. It moves to the next item correctly but when I swipe left I still see the previous picture... Have I implemented it wrong or is this a bug?

For the record: Im using the `1.1.2@aar` version of the library