fix insert with empty data given
add connection empty insert test
remove unused use statement
Document possible Sqlite datetime issues.
add charset option for pdo_pgsql driver

add charset option for pdo_pgsql driver
Merge pull request #449 from bantu/sqlite-datetime-issues

Document possible Sqlite datetime issues.
Merge pull request #424 from deeky666/DBAL-567

[DBAL-567] Add charset option for pdo_pgsql driver
Merge pull request #410 from deeky666/fix-connection-insert

Fix Connection::insert() with empty data given