Commit inicial para o AG em python

Acrescentando os esboços iniciais das classes AG e cromossomo.
Reorganização dos códigos

Início de uma estruturação do código em módulos
Início da construção dos operadores.
Before rewrite GA main code

Starting changing language from portuguese to english
Giving up using object orientation to the main code
Code works after rewrite

Selection, crossing and mutation basically implemented
Todo: implement sorting
First work completed

Individuals's sorting from a generation
Graphics of mean and graphics of the best individual
Fixed bug in selection method roulette_wheel
Adding some improves in graphics

Adds the worst fit in the performance graphics
Adds the level curves graphice
Before the code reorganization to improve API
Merge branch 'master' of github.com:paulequilibrio/ga