Fix https://groups.google.com/forum/#!topic/scalikejdbc-users-group/8tOlaKcjHnk
use MySQL and PosgreSQL in travis test. fix #288
Merge pull request #292 from xuwei-k/issue288

use MySQL and PosgreSQL in travis test. fix #288
reduce test time in travis
Merge pull request #295 from xuwei-k/reduce-test-time

reduce test time in travis