remove dead tables from schema.rb
remove dead tables from schema.rb

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