[tests] improved travis configuration, using mongodb driver for all PHP version, ref #465
[tests] improved travis configuration, using mongodb driver for all PHP version, ref #465

cross-solution/YAWIK,kilip/YAWIK,kilip/YAWIK,kilip/YAWIK,kilip/YAWIK,cross-solution/YAWIK,cross-solution/YAWIK,cross-solution/YAWIK