Adds metadata.json to darin-rt, creates dependency on apt, stdlib
Use debian/ubuntu backports to install RT
Document usage for installation of RT on debian/ubuntu
Accept $apt_backports on interface, default to false.
Remove deps on puppetlabs-apt, puppetlabs-stdlib, documented in README now
bust undefined function bug, use warning, rather than warn
Adds Debian support, RT install w/ postgresql tested trivially