Add "support" for Ubuntu 13.04 (raring lsb codename)

Cloudera only recognizes Precise (12.04) and Lucid. This pull request points to the Precise repo on Raring (13.04) systems. 

This *seem* to work by pointing 13.04 systems to the 12.04 packages - haven't fully tested but things seem copacetic in initial smoke tests.