[Fix] Changed project name.

Changed project name from "Appendix" to "Appendix.FSharp".
[Fix] Refactoring in "Differentiation.fs".

Changed the name of some members.
[Fix] Refactoring in "Optimization.fs".

Changed the name of some members.
[Fix] Refactoring in "MCMC.fs"

Change the name of some variables and functions.
[Fix] Refactoring in "Differentiation.fs" and "Optimization.fs".

Changed the name of some variables and functions.
[Add] C# wrapper for types in "MathNet.Numerics.Optimization".

Improved interoperability of numerical optimization types for C#.
[Add] Unit tests for "MathNet.Numerics.Optimization" classes.

Implemented two unit test classes: minimization test of simple bivariate function and maximum likelihood estimation test of simple linear model and GB2 density function.