Fixed: Runtime exception on .NET 4.6.2 giacomelli#58

Performance improvements.

New crossovers and TPL implementations

Fix issues giacomelli#49 and giacomelli#50.

Improved Sudoku extensions code coverage.

New Sudoku extension and GTK# sample

More code improvements suggested from Sonar.

Code quality improved with suggestions from Sonar.

* Features

   * Add geneValues parameter to FloatingPointChromosome giacomelli#34

* Bug fix
   * Bug/Error when using ParallelTaskExecutor giacomelli#40

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