Removed dependency on MonteCarloBlackScholesModel.

git-svn-id: http://svn.finmath.net/finmath%20lib/trunk@774 48fcbb9e-5639-0410-8b25-842128a4905d
Added limit cases to calculation of Black Scholes delta (e.g., when spot is zero or negative).

git-svn-id: http://svn.finmath.net/finmath%20lib/trunk@775 48fcbb9e-5639-0410-8b25-842128a4905d
Added limit cases to calculation of Black Scholes formula and Black Scholes delta (e.g., when spot is zero or negative).

git-svn-id: http://svn.finmath.net/finmath%20lib/trunk@776 48fcbb9e-5639-0410-8b25-842128a4905d
Added limit cases to calculation of Black Scholes formula and Black Scholes delta (e.g., when spot is zero or negative).

git-svn-id: http://svn.finmath.net/finmath%20lib/trunk@777 48fcbb9e-5639-0410-8b25-842128a4905d