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

[Paul Norman]

Setup notes from @apmon 
```
04:04 < apmon> pnormal: To register a new oauth app on facebook, go to https://developers.facebook.com/ and then choose the "app", "register new app" drop down
               menu item
04:16 < apmon> pnormal: For the MS live account, you can register the application at https://account.live.com/developers/applications/index
```

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/153#issuecomment-62177191
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