How can i use this Icons in NavigationView
Thanks for the great library. I need to use these Icons in my Drawer (NavigationView). So I tried to implement like the below method. But it is not working ?

``` xml
        <item
            android:id="@+id/nav_home"
            android:icon="@drawable/avatar_denholm"
            app:ico_icon="gmd-plus-circle"
            android:title="Home"/>
```
