Added <deletePasscodeFromKeychain> method.

Added <maxNumberOfFailedAttemptsReached> protocol method and its respective <kMaxNumberOfAllowedFailedAttempts> constant.

Replaced <showLockscreenWithAnimation> and <showLockscreenWithoutAnimation> with <showLockscreenWithAnimation:(BOOL)animated> method.

Improved the UIWindow handling.

Fixed the positioning problem that happened if the lockscreen was presented with an av/as open.

Improved folder structure.