PHPLIB-357: Refactor CountDocuments Operation to encapsulate Aggregate Operation
PHPLIB-357: Refactor CountDocuments Operation to encapsulate Aggregate Operation

jmikola/mongo-php-library,mongodb/mongo-php-library,jmikola/mongo-php-library,jmikola/mongo-php-library,mongodb/mongo-php-library,10gen-labs/mongo-php-library-prototype,mongodb/mongo-php-library,jmikola/mongo-php-library,jmikola/mongo-php-library-prototype,mongodb/mongo-php-library