Is correct this usage of IconicsButton ?
Hi mike, for a long time i use the IconicsButton like this:

```
                <com.mikepenz.iconics.view.IconicsButton
                    android:id="@+id/btnTest"
                    android:layout_width="48dp"
                    android:layout_height="48dp"
                    android:text="{gmi-plus-circle}"
                    android:textColor="@android:color/white"
                    android:textSize="24dip" />
```

with the text size in "dip" is correct ? or i should use "sp" now ?
