add stat collection to graphite

[MindHunter86]

don't forget about https://github.com/anilibria/docs/blob/master/api_v2.md#-getseedstats

[MindHunter86]

added temporary telegraf metrics for anilibria top50 users by upload + user MindHunter86

[[inputs.httpjson]]
  name = "anilibria_stats"
  servers = [
    "http://api.anilibria.tv/v2/getSeedStats?users=mindhunter86"
  ]
  tag_keys = [ "user" ]
  response_timeout = "5s"
  method = "GET"
  interval = "60s"

[[inputs.httpjson]]
  name = "anilibria_stats"
  servers = [
    "http://api.anilibria.tv/v2/getSeedStats?sort_by=uploaded"
  ]
  tag_keys = [ "user" ]
  response_timeout = "5s"
  method = "GET"
  interval = "60s"