Choose DTO properties to generate

[kzfabi]

Thanks to @sizilium who have suggested the following:

"A feature in your tool to choose what properties goes into a DTO would be great! Because normally you only want to transfer really needed properties through DTO's and not the whole bunch of informations which are propably not needed (because performance and design reasons).
It would be also useful to store these kind of mapping informations in the configuration file, so that I can store it in version control system for example. In case of refactoring the mapping should be updated automatically (when possible)."