Changed passcodeConfiguration from private to public

[timroejr]

Changed Variable Implementation from private to public. This allows developers to check to see if a passcode is present to determine if they want to show a specific view or not. I personally used this in a method that follows below

PasscodeLockViewController *vc = [lock getViewController];
    if ([lock hasPasscode]) {
        [self presentViewController:vc animated:TRUE completion:^{
            //We'll be showing something
        }];
    } else {
        //Nothing to Show
    }

This is a special case I have where running something like
passcodeLockPresent!.presentPasscodeLock() can't be used. In this case above I was calling on:

func getViewController() -> PasscodeLockViewController {
        let lock: PasscodeLockViewController = PasscodeLockViewController(state: .EnterPasscode, configuration: PasscodeLockConfiguration())
        return lock
    }

This Commit/PR would make it easier on the developer to determine if the user has a passcode such as in the case above.

For those wonder, '[lock hasPasscode];' with the modifications I made looks like this:

func hasPasscode() -> Bool {
        return passcodeLockPresenter!.passcodeConfiguration.repository.hasPasscode
    }

Thanks for taking a look at this PR! Please let me know if you need me to explain anything!