population-adjust

added methods for set and get population size and dna dimension.
changed populate method

- Changed population populate method.
- Created deleteIndividuals method.
- Added debug console error prints for some population methods.
Engine changes

-Engine does not has stepEngine anymore.
-Single engine has stepEngine as own method.
-startEngine is now public.
Organization of files in folders
Merge pull request #4 from PintosGregorianos/adjustment-first-test

Adjustment first test