Drawer navigation item styles should have possibility to be overriden when showsTouches !== false

[kepi74]

It's not possible to override View styles in _renderDrawerItems(), when drawer item showsTouches !== false.
It can be fixed by change on line 93 in ExNavigationDrawerLayout from <View style={styles.buttonContainer}> to <View style={[styles.buttonContainer, isSelected ? item.selectedStyle : item.style]}> and removal of style property of TouchableNativeFeedbackSafe.