pareto filter based on Messac et al. 2003
Added Pareto Filter to README
fixed the warm start stuff to always feasible solutions.
Merge pull request #2 from b-schubert/fix/warmstart-fix

fixed the warm start stuff to always feasible solutions.
Testings
Merge pull request #3 from b-schubert/fix/warmstart-fix

fixed the warm start stuff to always feasible solutions.
Merge branch 'develop' of https://github.com/b-schubert/bi-objective-solver into develop
Merge pull request #4 from b-schubert/feature/pareto-filter

Feature/pareto filter
Merge branch 'develop' of https://github.com/b-schubert/bi-objective-solver into develop
initialization changes

warm-start was something wrong... think it happend during the reset yesterday.

changed some logic and odering in the approximation scheme
fixed approximation bug
Merge pull request #5 from b-schubert/fix/approximation_point_comparison

Fix/approximation point comparison
adding tests
NormalConstraint implementation untested
Merge branch 'feature/normal-constraint' of https://github.com/b-schubert/bi-objective-solver into feature/normal-constraint

Conflicts:
	cplex_impl.py