added test to check support for setting PDO::ATTR_CASE and fetching table schemas
fixed fetching table schemas for mysql when PDO::ATTR_CASE is set
added tests for oci
fixed fetching composite fks for oci
improvements in oci schema parsing
removed autoIncrement detection fro oci and added test to verify that
implement batchInsert for oci
fix detecting IntegrityException for oci
fixed creating raw sql by skipping object and resource params
fix command test failing for sqlite