CUBRID Database 9.0 Support

CUBRID Database 9.0 patch for #1892.

It's been over two years since users have been [requesting](http://www.yiiframework.com/forum/index.php/topic/12721-cubrid-support-for-yii/) CUBRID Database support.

I would like to contribute the working code with:

- CUBRID 9.0+ support through PDO_CUBRID-9.0.0.0001+
- CUBRID DB Schemas
- _*cubrid.sql_ data files for demo projects and tests
- Two test files
- Updates to *YiiBase.php* and *yiilite.php*.

I have tested with **blog** demo app as well as ran those 2 test files which are functionally identical to those of MySQL. Tests all pass.

Currently the code is hosted at my repo https://github.com/kadishmal/yii/tree/cubrid-database-support. The actual code commit is [c0b90c73b](https://github.com/kadishmal/yii/commit/c0b90c73bba4c1f2ce630085921d2400ef53628f).

Let me know if you have any comments.