added daycounter and payment schedule test
improved date test, and simple yield for design pattern
added lazy object test... sabr model copied...
added another simple yield test, using HANDLE
some minor changes
beginning math test, integration
added several math test...
test integral
commit at home
added namespace for optimizer
error?
modified optimizer and added random number test...
added yield curve and vol smile test...
added option payoff, stoch process and one simple ex
home test