Fixed PHP-1075: close() with parallelCollectionScan() segfaults upon request shutdown
Merge pull request #681 from bjori/PHP-1075-parallel-collection-scan-segfault-close

Fixed PHP-1075: close() with parallelCollectionScan() segfaults upon req...

* bjori/PHP-1075-parallel-collection-scan-segfault-close:
  Fixed PHP-1075: close() with parallelCollectionScan() segfaults upon request shutdown
Merge remote-tracking branch 'upstream/v1.5'

* upstream/v1.5:
  Fixed PHP-1075: close() with parallelCollectionScan() segfaults upon request shutdown