NullPointerException 
@mikepenz you've made a great lib! How to fix it?
Crashed on release configuration with proguard
Error stacktrace 

``` java
 Caused by: java.lang.NullPointerException
 at java.lang.Enum$1.create(Enum.java:43)
 at java.lang.Enum$1.create(Enum.java:35)
 at libcore.util.BasicLruCache.get(BasicLruCache.java:54)
 at java.lang.Enum.getSharedConstants(Enum.java:209)
 at java.lang.Enum.valueOf(Enum.java:189)
 at com.mikepenz.google_material_typeface_library.a.k(SourceFile:123)
 at com.mikepenz.google_material_typeface_library.GoogleMaterial.getIcon(SourceFile:37)
 at com.mikepenz.iconics.utils.IconicsUtils.placeFontIcon(SourceFile:219)
 at com.mikepenz.iconics.utils.IconicsUtils.findIcons(SourceFile:164)
 at com.mikepenz.iconics.Iconics.style(SourceFile:159)
 at com.mikepenz.iconics.Iconics$IconicsBuilderString.build(SourceFile:221)
 at com.mikepenz.iconics.view.IconicsTextView.setText(SourceFile:42)
 at android.widget.TextView.setText(TextView.java:3683)
```

my_activity.xml:

``` xml

        <com.mikepenz.iconics.view.IconicsTextView
            android:id="@+id/asd"
            android:textColor="@color/colorPrimary"
            android:textSize="28sp" />
```

MyActivity.java

``` java

public class MyActivity extends AppCompatActivity {
    @Bind(R.id.asd)
    protected IconicsTextView asd;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        setContentView(R.layout.my_activity);
...
        asd.setText("{gmd-cloud-off}");
    }
```
