Fixed and added tests for Conway's 4 rules
Cleaning up console.logs
Refactored to remove some if statements
Refactored numLiveNeighbourCells to one line
Refactored getValidNeighboursAt
Moved modifying cell state to Cell class
Removed whitespace
Added Cell tests
Added link to online jasmine tests
Refactored to use the isAlive() public getter from the Cell class
Refactored the 2 for loops to use Array filter and forEach
Merge branch 'master' into gh-pages