LBFGS++ v0.3.0

Added

• Added functions final_grad() and final_grad_norm() to LBFGSSolver and LBFGSBSolver to retrieve the final gradient information (#12)

Changed

• LBFGS++ now requires C++11
• The line search classes now have a unified API for both LBFGSSolver and LBFGSBSolver
• The Moré-Thuente line search algorithm LineSearchMoreThuente now can also be used in the L-BFGS solver LBFGSSolver
• Improved the numerical stability of LineSearchNocedalWright (#27)
• Removed the unused variable dg_hi in LineSearchNocedalWright (#35)
• Fixed some compiler warnings regarding shadowed variables (#36)