added method to reset passcode settings
fixed tableview cell selection/deselection bug
added class property to be able to instantiate any subclass of KKPasscodeViewController for customization purposes
failedAttemptsCount stored in the keychain to avoid to be reset killing the app
implemented passcode block feature
added extra delegate to settings view controller to be able to reproduce the same app logic
redirected delegates method to extra delegate in settings view controller
improved passcode view controller appearance on iPad (presented as form sheet)
navigation controller of passcode view controller now respects customised navigationbar and toolbar classes
Merge branch 'master' of https://github.com/valeriomazzeo/KKPasscodeLock
Merge pull request #32 from valeriomazzeo/master

Project improvements