+ added tests and fixed behavior

sqlite does not seem to allow using boolean values in select query

should be tested for all dbms not only cubrid even if the problem may
not exist in all of them it is good to verify that.

http://www.yiiframework.com/forum/index.php/topic/48359-inserting-nulls/page__view__findpost__p__226019

closes #1084

cubrid pdo does not support PARAM_BOOL so we cast the value to integer
and store 0 and 1 instead

fixes #964

fixes #854

fixed expected quoting

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