Added a localization file.
Generalized the Product.wxs so that it is now simple to adapt to a real project.
Added the possibility to specify a folder different than the Microsoft one (both in the Product.wxs and in the custom action).
Solved an issue related with the system culture in the custom action.
Moved the xll components in a different fragment.
Merge pull request #9 from ale003/master

Updated product.wxs and added the possibility to change the install folder