Add options to set scripts prefix folder and test prefix folder

[franciscomemoli]

Based on this kind of questions and my own need I develop the option to set the prefixes folders for scripts and test. http://stackoverflow.com/questions/18703293/how-do-i-change-the-path-for-generated-files-for-the-generator-angular-in-yeoman http://stackoverflow.com/questions/40429624/how-to-change-the-folder-where-yeoman-generator-angular-create-test-files/41528013#41528013