Fix android's image tintColor prop when used with alpha

Summary:Fixes #6075
UIExplorer example has been tested with 4 levels of opacity(100,75,50,25)

![selection_029](https://cloud.githubusercontent.com/assets/11550281/13228124/31c85dcc-d9c0-11e5-90e3-3938e155d5a2.png)
Closes #6090

Differential Revision: D2979913

Pulled By: mkonicek

fb-gh-sync-id: ff30dec853935a059979096d9b1da9088d146249
shipit-source-id: ff30dec853935a059979096d9b1da9088d146249

ReactAndroid/src/main/java/com/facebook/react/views/image/ReactImageManager.java

@@ -14,6 +14,7 @@
 import java.util.Map;
 
 import android.graphics.Color;
+import android.graphics.PorterDuff.Mode;
 
 import com.facebook.drawee.backends.pipeline.Fresco;
 import com.facebook.drawee.controller.AbstractDraweeControllerBuilder;
@@ -120,7 +121,7 @@ public void setTintColor(ReactImageView view, @Nullable Integer tintColor) {
     if (tintColor == null) {
       view.clearColorFilter();
     } else {
-      view.setColorFilter(tintColor);
+      view.setColorFilter(tintColor, Mode.SRC_IN);
     }
   }