Fixed one instance of PHP-296 in ->batchInsert()
Fixed PHP-296: MongoCollection->update() doesn't convert the options

The option argument is also typehinted to array, so removed dead code
Fixed PHP-296: MongoCollection->remove() doesn't convert the options

The option argument is also typehinted to array, so removed dead code
More zend_hash_find() fixes for PHP-296

These are however tricky to create tests for
Merged pull request #354