Calculates price of Asian option using German and Yor approach as descrbed in paper On the valuation of Asian options: the Geman-Yor Laplace transform revisited, December 2000, 24pp
LaLaplaceTransform function in file asianpricer.cpp is based on function Dv(a,z) as described in page 7 of the paper.
Note:
1.To do the inverse laplace transform, integration is performed after the bigger pole (2v+2)
2.There is problem with integration function not behaving well for oscillations, hence chunks of quad ouput are used for convergence

Results are verified to values mentioned in FMW test problem 1,2,3 mentioned in page 5 of Pricing Asian Options by Contour Integration