remove deprecated classes (IntegralInvariantGaussianCurvatureEstimator and IntegralInvariantMeanCurvatureEstimator. Use instead IntegralInvariantVolumeEstimator or IntegralInvariantCovarianceEstimator with good functor from IIGeometricFunctors
changelog
Merge pull request #893 from jlevallois/DeleteDeprecatedClasses

Remove deprecated classes
Merge branch 'master' into Feature