Do not consider currentMarker as Cloud Queues does not expose one per element but provides one in the nextUrl.
Revert "Do not consider currentMarker as Cloud Queues does not expose one per element but provides one in the nextUrl."

This reverts commit eb5580ab64aa04bc0f60e36e85f34237fea9f0d9.
Create and use custom MessageIterator for iterating over queue messages.
Making the PSR-2 lint checker happy.
Merge branch 'working' into fix-pagination-for-queues
Ensuring numMessagesListed == numMessagesCreated using PHPUnit.
Merge pull request #448 from ycombinator/fix-pagination-for-queues

Fix iteration of queue messages