[#47] Changed excepts to onlys in routes
[#47] Corrected redirect_to arguments after create method in PlaceRentsController
[#47] Moved finding Parking with given id to method which uses cached variable
[#47] Used current_user method in index, edit, update and destroy methods in PlaceRentsController
[#47] Added association belong_to owner to PlaceRent model
[#47] Changed creating PlaceRent building it now using Parking association