Use MongoDB 3.0 for prefer-lowest CI environment
Use MongoDB 3.0 for prefer-lowest CI environment

mongodb/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,jmikola/mongo-php-library-prototype,jmikola/mongo-php-library,mongodb/mongo-php-library