Mass delete feature

Signed-off-by: Suki <suki@missallsunday.com>
Actually, lets create a separate method for this...

Signed-off-by: Suki <suki@missallsunday.com>
OAward::readBy()

Signed-off-by: Suki <suki@missallsunday.com>
OAward::deleteBy()

Signed-off-by: Suki <suki@missallsunday.com>