exceptions: added IOException
exceptions: added IOException

Mikulas/dbal,nextras/dbal,Mikulas/dbal,jasir/dbal,nextras/dbal,Mikulas/dbal,dyamon-cz/nextras-dbal,nextras/dbal,dyamon-cz/nextras-dbal,jasir/dbal,jasir/dbal,dyamon-cz/nextras-dbal