## Refactor

### Change dependency graph
- A circular dependency between SimpleGeneticAlgorithm and Individual were implemented using service locator pattern and 
static classes. 

### Population
- Add a second constructor. size parameter were never used if createNew was false

### Individual
- Move getFitness method from SimpleGeneticAlgorithm to Individual

### Prepare support for class inheritance

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## Limit number of generations


## Roulette selection
To be done

## Cross-over rate
To be done

## Variable-length bit strings
To be done