gradient for cubic b-splines, and hessian for all b-splines#99

Merged

tomasaschan merged 5 commits intomasterfrom

tl/cubic-gradient

Jan 25, 2016

Commits on Jan 15, 2016

Refactor utils functions into own source file
Tomas Lycken
committed
Implement gradients for cubic b-splines
Tomas Lycken
committed

Commits on Jan 18, 2016

Implement Hessian
Tomas Lycken
committed
Squash a few bugs
Tomas Lycken
committed
Use `_build_woodbury_specs` everywhere
Tomas Lycken
committed