PDO/Adapter updates from 1.2.5:
- added tinyint(1) as boolean for mysql, oracle, postresql, sqlite.
- added timestamp as date for mysql.
- decribeColumns method has been refactored in oracle, postesql, sqlite.
- added constraint creation for foreign key
Missed unit-tests/DbDialectTest.php.
Merge pull request #1719 from lantian/1.3.0

PDO/Adapter updates from 1.2.5