Added nuget package file support.
Fixed package install issues.
Added ECheck support for transacitons. Added Payment class for inheritance purposes for CreditCard and ECheck classes.
Added ECheck support for transacitons. Added Payment class for inheritance purposes for CreditCard and ECheck classes. Tagged as v 0.7.0.
Changed assembly information and tagged to v.0.7.0
Merge branch 'development' of https://github.com/damon-e-drake/authorize-net into development