Initial modifications to run with SPENSER data

[crangelsmith]

• [x] Modify setup.py file removing version for tables
• [x] Add mortality test
• [x] New TestPopulation object that contains our data.
• [x] Add dummy Testfile.csv to get CI working

[crangelsmith]

To run this you need to:

• Modify the path to the data files in lines 17 and 19 of tests/population/test_mortality.py for your own path
• Make sure your file has the columns PID,location,sex,age,ethnicity
• Run:
  • python setup.py install
  • pytest tests/population/test_mortality.py