- Added drop/add primary key methods to QueryBuilder.php
- Added mysql specific dropPrimarykey method
- Added sqlite specific dropPrimarykey and addPrimaryKey methods
- Added uint testing for dropPrimarykey and addPrimaryKey methods
- Corrected postgresql column types, by adding length and precision

- The dropConstraint method can be used both for dropPrimaryKey and dropForeignKey

Multilevel Nav items

Pgsql driver implementation (update 4)

Fixes #13. Implement DB message source.

Fix use incorrect namespace of Html helpers

Conflicts:
	framework/yii/logging/ProfileTarget.php

Update CompareValidator.php

Fix new method name "getIsAjax" and fix web application class name in logger

command since postgres does not accept db creation in multiline statement.

Refactored == null to is_null == '' to empty(...)