Optimized interpolation multiplications.
Optimized for speed and accuracy.
Merge branch 'feature/optimize_member_to_cover' into feature/optimize_interpolation
Merge branch 'feature/optimize_interpolation' of https://github.com/HotFusionMan/spliner into HotFusionMan-feature/optimize_interpolation
Compatibility with older rubies lup_decomposition
Added ruby 2.0.0 to Travis matrix