Fix spelling of 'transaction'.
Fix spelling of 'transaction'.

rreckel/Squeryl,kanischev/Squeryl,wukaikailive/squeryl,xuwei-k/Squeryl,Krasnyanskiy/squeryl,broadinstitute/Squeryl,ccap/Squeryl,takezoux2/squeryl-experimental,rreckel/Squeryl,squeryl/squeryl,Krasnyanskiy/squeryl,broadinstitute/Squeryl,wukaikailive/squeryl