Added 3 parameter scaling function

Simply adds a 3 parameter function to to MatrixTransformStack so a matrix can be scaled on different axis

src/main/java/com/jozufozu/flywheel/util/transform/MatrixTransformStack.java

@@ -42,6 +42,12 @@ public class MatrixTransformStack implements TransformStack {
 		return this;
 	}
 	
+	@Override
+	public TransformStack scale(float factorX, float factorY, float factorZ) {
+		internal.scale(factorX, factorY, factorZ);
+		return this;
+	}
+
 	@Override
 	public TransformStack push() {
 		internal.pushPose();