Interface IDao and IRequest communication improvements
Interface IDao and IRequest communication improvements

Conflicts:
	src/main/java/gr/teicm/se/ClosestOfferFinder/clientbackend/Controller.java
	src/main/java/gr/teicm/se/ClosestOfferFinder/clientbackend/StubDao.java
	src/main/java/gr/teicm/se/ClosestOfferFinder/clientbackend/interfaces/IDao.java