Adds new data files for fermi vela region, including background npred counts, counts, exposure and psf for the region
Updates README file for fermi vela region dataset
updates sh files outlining commands used to produce the data files
updates model file for fermi vela region
Adds Fermi diffuse background model cut out for Vela region
Updates README file to account for the cut out Fermi Diffuse model file added
Merge pull request #2 from ellisowen/vela_data

Vela data