[ALOY-983] Popover height and width are ignored when using ContentView element

<!-- app/views/index.xml -->
<Alloy>
    <Window>
        <Button id="button" onClick="openPopover">Show Popover!</Button>
    </Window>
</Alloy>

<!-- app/views/popover.xml -->
<Alloy>
    <Popover id="popover" height='100' width='250'>
        <!-- If you remove the ContentView tags, it works as expected -->
        <ContentView>
	    <View id="popView" backgroundColor='green'>
	        <Label>Alloy Popover!</Label>
	    </View>
	</ContentView>
    </Popover>
</Alloy>

// app/controllers/index.js
function openPopover() {
    var popover = Alloy.createController('popover').getView();
    popover.show({view:$.button});
};

$.index.open();

var win = Ti.UI.createWindow();
var button = Ti.UI.createButton({title: 'Show Popover'});

var popView =  Ti.UI.createView({
	backgroundColor: 'green'
});
var label = Ti.UI.createLabel({text: 'Titanium Popover!'});
popView.add(label);

var popover = Ti.UI.iPad.createPopover({
	width: 250,
	height: 100,
	contentView: popView
});

button.addEventListener('click', function(e){
	popover.show({view: button});
});

win.add(button);
win.open();