abstracting GameOfLife simulator base class
simplified Conway's game of life
completed dummy implementation of FakeGameOfLife
run() function is void
use custom window size (or default)
adjusted examples
some note on testing graphical observers
updated API
flake8 check (fixed pep8 violations)
Implemented and tested SIR epidemiology model
flake8 check (fixed pep8 violations)
additional checks on test_run of Conway fixture
no tests for graphical impressions
added SIR model
separate examples
added SIR example (for both console and SFML)
ready for v0.2.0