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(...)