0.04 (2013-08-31)
    +) Added 'txn_commit' shortcut as 'commit' callback
    *) Some code improvements
    +) Added 'dbh' accessor
    +) All callbacks now get a $pool object and may be $item as second argument

0.03 (2013-08-28)
    *) Some doc fixes

0.02 (2013-08-27)
    *) Some fixes

0.01
    *) Final release for CPAN
