Renamed a method in the examples' RandomGraphProblem class and fixed some comments.

- Renamed RandomGraphProblem::findExactParetoSet() to
  RandomGraphProblem::computeExactParetoSet() inside
  both examples/biobjective_shortest_path/ and
  examples/tripleobjective_shortest_path/ .
- Fixed some of the examples' comments.
Wrote code for the experiments vs NAMOA*. Experiments work for 2 objectives, an assertion error sometimes for 3 objectives.