Refactor TravisCI config to run separate jobs
Refactor TravisCI config to run separate jobs

- Runs Brakeman analysis
- Runs bundle-audit analysis
- Runs all RSpec specs with PostgreSQL
- Runs all RSpec specs with MySQL

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