tweak acts_as_isa code, tidy up a little
tweak acts_as_isa code, tidy up a little

playing the codeclimate game

stuzart/seek,HITS-SDBV/seek,SynthSys/seek,SynthSys/seek,HITS-SDBV/seek,SynthSys/seek,HITS-SDBV/seek,SynthSys/seek,stuzart/seek,stuzart/seek,HITS-SDBV/seek