fixed Gauss-Lobatto integration for zero function (thanks to Peter
Caspers)
added wrapper for boost cumulative normal distribution function
fixed formatting
fixed formatting
align C++ and SWIG interface for class Exercise
Update payoffs.hpp
Merge changes from master.
Remove unneeded method.

It is already inherited from the base class.
Merge pull request #135.
Merge pull request #127.
Updated .gitignore
Revert "Updated .gitignore"

This reverts commit 3f99547d3f030e23a3b1b71e77c65ead59d445c1.
Merge remote-tracking branch 'upstream/master'