Create TestHerdSimilarityMatrix class   - Add numpy to imports   - Create contrived population to test   - Create test matrix that checks similarity directly   - Use all to assert all entries same as sim matrix
Create TestHerdSimilarityMatrix class
  - Add numpy to imports
  - Create contrived population to test
  - Create test matrix that checks similarity directly
  - Use all to assert all entries same as sim matrix

nsh87/ehrcorral