This reverts commit 9d7597d6, reversing
changes made to 6b6390f7.

- 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

Check output bundle file format has been added to "AssetControllerTest::testActionCompress()" unit test.

removed test param 'appClass' as it does not make sense to configure
application class for all tests, some explicitly need webapp where
some might explicitly need console app.

Feature was requested in yiisoft/yii#765