Crossover/Mutation:
- Split into individual and population subclasses.
- Added sequential population crossover selection.
- Renamed and reimplemented mutation methods.
EasyGA:
- Improved make_obj methods for the chromosomes and populations to take arguments.
Initialization:
- Improved to shorter code.
- Fixed repeated error messages
Chromosome:
- Changed get/set_genes to get/set_gene_list.
