Reverted 0bf2dadd: it's very common to use lower case for column types and upper case for other DB keywords.

http://jira.cubrid.org/browse/APIS-658

bit has special syntax for storing and retreiving so we'd need a
converter for that.
Storing 1 bit will result in one byte left padded on the disc so the
result of a query for boolean 0 will be 0x00 and for boolean 1 will be
0x80.

- 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

Feature was requested in yiisoft/yii#765

- Better names
- Removed not used MySQLTestCase
- Moved base testcase for DB to db namespace
- Minor style fixes

Appended newlines to every PHP document that did not have a newline as the last character in the file.

finished Sort.

Added support for scopes defined in AR classes.