Instagram stats using Facebook API

[piketres]

First version of the instagram stats Arduino library using official Facebook API. The setup is a little bit more complex than before but it is working whereas the previous version was being blocked by Instagram.

Unfortunately is not backwards compatible but I don´t think it could have been the case given that now we need the access token and the ig-user-id.

I hope it helps

[piketres]

Unfortunately the new code won´t pass the old tests... But how can these tests be done if a specific access token needs to be generated? Should it be removed?