Added comments & fixed small bug

Mostly added comments, but also fixed a small bug in parent selection where the tournament size would be much smaller than it should be.

src/fitness_function/fitness_examples.py

@@ -16,11 +16,9 @@ class Fitness_Examples:
         return fitness
 
     def index_dependent_values(chromosome):
-        """A very simple case test function - If the chromosomes gene value is a 5 add one
-         to the chromosomes overall fitness value."""
-        # Overall fitness value
+        """Test of the GA's ability to improve fitness when the value is index-dependent"""
+        """If a gene is equal to its index in the chromosome + 1, fitness is incremented"""
         fitness = 0
-        # For each gene in the chromosome
         for i in range(len(chromosome.gene_list)):
             if (chromosome.gene_list[i].value == i+1):
                 fitness += 1