OpenGamma/OG-Platform — pull request #129 by yukiiwashita (2014-07-30 16:28:25+00:00)
Title: Topic/plat 6661

* Log interpolators for Natural, Not-A-Knot, Clamped cubic splines are added.
* Consistency with the fundamental interpolators is checked.
* Node sensitivity and curve gradient are tested against finite difference approximation.