Refactoring: moved the GoodGetModule file/class into the Properties folder of the GoodGet project.
Refactoring and commenting: decided to rename PackagesFolder.Update to .Install(). See code comment.
Added static method InstallPackages to PackagesFolder class, a one-line usage interface to the GoodGet module core functionality.
Extended PackagesFolder with a Path field, and forced it to be given upon creation, to make sure we know where packages are to be installed.