[TIMOB-14936] iOS7: Titanium.UI.Tab icon and activeIcon issue and proposed selectedIcon

// In this screenshot for the code using a new project, 
// the icon and activeIcon properties are set on the first two tabs. 
// The first tab is selected and should have the activeIcon, it shows the icon.
// Tab 3 is showing the selected image for reference and it does not have activeIcon set.


// this sets the background color of the master UIView (when there are no windows/tab groups on it)
Titanium.UI.setBackgroundColor('#000');

// create tab group
var tabGroup = Titanium.UI.createTabGroup();

// create base UI tab and root window
var win1 = Titanium.UI.createWindow({  
    title:'Tab 1',
    backgroundColor:'#fff'
});
var tab1 = Titanium.UI.createTab({  
    icon:'tab-groups.png',
    activeIcon:'tab-groups-selected.png',
    title:'Tab 1',
    window:win1
});

// create controls tab and root window
var win2 = Titanium.UI.createWindow({  
    title:'Tab 2',
    backgroundColor:'#fff'
});
var tab2 = Titanium.UI.createTab({
    icon:'tab-groups.png',
    activeIcon:'tab-groups-selected.png',
    title:'Tab 2',
    window:win2
});

var win3 = Titanium.UI.createWindow({
    title:'Tab 2',
    backgroundColor:'#fff'
});
var tab3 = Titanium.UI.createTab({
    icon:'tab-groups-selected.png',
    title:'Tab 3',
    window:win3
});

// add tabs
tabGroup.addTab(tab1);  
tabGroup.addTab(tab2);  
tabGroup.addTab(tab3);

// open tab group
tabGroup.open();