V0.2.0

Added support for Line Search methods (i.e. Curvature, Weak Wolfe and Goldstein Conditions).

V0.1.0

Added support for Linear Conjugate Gradient(LCG), Basic Nonlinear Conjugate Gradient(FR, PRP, HS, CD, DY, LS, HZ, HS-DY) methods and two line search function(Armijo & Strong Wolfe).
Fix some bugs and mistakes.