Added l-bfgs and owl-qn optimizers
Added l-bfgs and owl-qn optimizers

yanqingmen/Wapiti,yanqingmen/Wapiti,Neseb/wapiti,yanqingmen/Wapiti,yanqingmen/Wapiti,Jekub/Wapiti,Jekub/Wapiti,yanqingmen/Wapiti,Neseb/wapiti