[rutube] Use _download_json
[comedycentral] Update test title for 34cbc7ee8db36e85d2021455f468c5dc2da616b8
[comedycentral] Change XPath .//guid to ./guid (fixes #2668)

It fails to find the element in python 2.6 and it's not required, the
element is a direct child of the item node.