Merge pull request #69 from lsst/TwinklesCatalog_2

Twinkles catalog 2: 
- Implements the ability to read SN model parameters off fatboy database tables
- produce input catalogs for phoSim
- tests pass with latest commit : https://ci.lsst.codes/job/stack-os-matrix/16312/label=centos-6,python=py2/console
- Discussed changes implemented
- Will Close #49 and #51 which are superseded by the implementation here and some previous commits
- Close Jira SIM-1759