def getObjectFromUrl(url,type=nil)
      method = 'getObjectFromUrl'
      type = BaseObj if not type
      args = {:url=>url}
      return_object type,method,args,true
    end
def getObjectFromUrl(url,type=nil)
      method = 'getObjectFromUrl'
      type = BaseObj if not type
      args = {:url=>url}
      return_object type,method,args,true
    end
Return the object that the supplied Rdio url is a representation
 of, or null if the url doesn't represent an object.