Well, the answer is very very very Apple simple in Xcode 5!
In the Project Navigator on the left side, click 2 x slowly and the Project file name will be editable.
Type the new name.
A sheet will appear with a warning and will list all the items Xcode 5 believes it should change.
You can probably trust it, but you should inspect it.
The list will include the info.plist and various files, but also all the relevant strings from nib/xib files like MainMenu menus.
Accept the changes and you will get the prompt to save a snapshot of the project.
Always make a snapshot when Xcode asks, it will be useful to restore if something does not work.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…