new property cloneName for ATZPackage

It's useful for installing (file | project) templates if the template name is very long and/or more descriptive than just one word. In my case (Cappuccino file templates for Xcode) the name is too long to fit into the small left sided table of the file template chooser. [see this screenshot](https://dl.dropboxusercontent.com/u/34133216/WebImages/Github/CappuccinoFileTemplatesForXcode.png)

So, to set this property in JSON is an option. If it's present it will be selected during installation, otherwise the `name` property is the favorite.