RepairSolution is added

A class called RepairSolution is added to repair a complete solution .
A small change in two repair method.
new NGGA-II is added

A new NSGA-II algorithm is added to deal with repair function. The class
inherits the main NSGA-II of jmetal and do the same task. The only think
is here that after creating each individual, it is require to repair the
individual. And after each crossover and mutation, repair of the
individual is done.