Added support for statsV2

[ekorian]

There is now a statsV2 object that appears to be gradually replacing the original stats object.
This patch avoids crashes due to statsV2-only users, and gives priority to statsV2 over stats when both are present.

{
"stats": {"collectCount": 2787, "commentCount": 16000, "diggCount": 22600, "playCount": 1800000, "shareCount": 259}
}

{
"statsV2": {"collectCount": "2787", "commentCount": "15955", "diggCount": "22609", "playCount": "1776621", "shareCount": "259"}
}