/api/1/revision/origin/log - Unify pagination

That endpoint is paginated. However, the implementation is not consistent with #605. We should now use 'Link' headers in the response as in #605 (more information on https://developer.github.com/v3/#pagination).

Since the api, when browsed through the browser, is now able to display those header information (#633 (closed)), nothing prevents us from adapting the results now.

Cf. #637 (closed)

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Migrated from T638 (view on Phabricator)