made the brakeman and bundle audit checks conditional so that they only run against master
made the brakeman and bundle audit checks conditional so that they only run against master

DMPRoadmap/roadmap,CDLUC3/dmptool,CDLUC3/dmptool,DigitalCurationCentre/roadmap,CDLUC3/dmptool,DMPRoadmap/roadmap,DigitalCurationCentre/roadmap,DigitalCurationCentre/roadmap,CDLUC3/dmptool,DMPRoadmap/roadmap