noosfero | Add Metadata plugin (#359)

[Bráulio Bhavamitra]

New comment for Merge Request 359

https://gitlab.com/noosfero/noosfero/merge_requests/359#note_833886


Bráulio Bhavamitra

unfortunelety, facebook can only work with one domain, and it will error if you have an app (for oauth, for example). So if you use your app namespace within `og:type`, then `og:url` will have to use exactly the domain specified on app.

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