Implement support for pagination for responses returning lists

[Balletie]

Responses which returns a list of items are paginated to 30 items by default. See documentation here: https://developer.github.com/v3/#pagination

Examples of requests that return paginated results are for example listing the commits of a repository, listing the repositories of a user.

Ideas to implement support for this is to use the Iterator pattern (which can optionally go both ways, i.e. next page and previous page).