[WIP] Added a new method cloneable? to check if VMs/Templates can be cloned or not

issue #253
https://bugzilla.redhat.com/show_bug.cgi?id=1122712
@gmcculloug The UI (i.e the YAML file) disbales the Clone button if two or more VMs/Templates are selected, therefore you would never be in a situation where you are passing multiple id's to cloneable? It will always be one id.