Support paging through multiple requests.

Remade #76 as pull request.

added 10 commits

• 0bf6e595...02102dae - 9 commits from branch project:8.x-5.x
• 0e95af2a - Merge branch '8.x-5.x' of gitlab.com:drupalspoons/migrate_plus into 8.x-5.x

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added 1 commit

• 48a9f7e3 - Fixed "Undefined index: next" error

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This will need significant work to rebase on 6.x. Instead of doing that, closing this so a new PR can be opened instead.

closed