Padding is not working properly on Android M
Hi. I noticed that `android:padding` setting for `IconicsImageView` is not working properly on Android M. 

![paddings are not applied propery](https://cloud.githubusercontent.com/assets/2552365/8694105/6c62b804-2b17-11e5-8d2f-7fdd6fc8032f.png)
### code  (activity_playground.xml)

``` xml
<com.mikepenz.iconics.view.IconicsImageView
    android:layout_width="72dp"
    android:layout_height="72dp"
    android:padding="24dp"
    app:iiv_icon="faw-android" />
```
