Fixed PHP-303: Support the autoIndexId option for createCollection.
Merge branch PR #311

* pull-request/311:
  Fixed PHP-303: Support the autoIndexId option for createCollection.
Fixed PHP-508: Change BSON ID generation to use random "increment".
Merged Pull Request #312

* pull-request/312:
  Fixed PHP-508: Change BSON ID generation to use random "increment".
PHP-506: Added a test case, but the behaviour was already correct.
Merged Pull Request #315

* pull-request/315:
  PHP-506: Added a test case, but the behaviour was already correct.
Fixed PHP-490: "nolock" option in MongoDB::execute method.
Merged PR #313

* pull-request/313:
  Fixed PHP-490: "nolock" option in MongoDB::execute method.