geändert:       db/model.js
            feature : not allow two identical username or email in the
            db

	geändert:       routes/einloggen.js
	geändert:       routes/registrieren.js
        geändert:       validator/validate.js
        geändert:       validator/validateEinloggen.js
        geändert:       validator/validateRegistration.js

        Few change and improvements here !!!! check the diff , to see
        more.

	gelöscht:       validator/customValidators.js
        since I decide to implement my own validator module , i dont
        need to the way npm package "express-validator" want me to go.
        therefor this file was useless