[#34] Controller name display - changed params[:controller] and capitalizing to humanizing
[#39] Current_user helper using improved
[#42] Dropdown menu improved.
[#43] Link to parking added (from rent index view)
[#44] Code finishing all rentals moved to model and callback used
[#46] Range scopes fixed
[#48] Some ifs changed to one line version
[#50] Person name method fixed
[#52] Flash messages partial updated
[#53] Handling exceptions added. Flash used
[#55] Devise authentication added