Fixed timezone test not to be dependent on the millisecond executed.

Timezone test would fail if the current millisecond value was 500 or over as MySQL would round up to the next second and then the assertion checking the time at a second precision would fail. As noted in the comment, `datetime` in MySQL does not store millisecond values, unless `datetime(6)` is used and MySQL version is greater than 5.6.4.

Also added node 0.10 to travis-ci.