[openstreetmap-website] Add support for "login with Facebook" and MS live (#153)

[simonpoole]

We need to ask Facebook (or rather their legel department) if they would be OK with us using it. Nominaly we would not be adhereing to their terms,

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https://github.com/openstreetmap/openstreetmap-website/pull/153#issuecomment-21294309
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