Add views count for episodes

[zakariaelas]

As discussed in #137, this implements adding a views count for episodes by querying the FB Graph API.

Unfortunately, Facebook does not support getting the number of views for videos created on Facebook groups, only for Facebook pages (more on this here).

@yjose I am creating this pull request just so you can see if I need to change anything while waiting for Facebook to review the app.

Thanks and please let me know what you think :pray:

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