Make driver compatable with mongodb extension 1.x and 2.0

Merge request !45Make the database driver work with both versions of the PHP extension for MongoDB → (Open) created by daffie

Merge request !46Make the database driver work with both versions of the PHP extension for MongoDB → (Open) created by daffie

Merge request !47Make the database driver work with both versions of the PHP extension for MongoDB → (Open) created by daffie