多种风格的支付框控件，可定制加密图片，也可使用带动画的弹窗。A variety of styles of payment box controls can be customized to encrypt pictures, can also be used with animated alert.
1、可以控制每个单元格之间的距离，不再是紧密排在一起 2、支持下划线样式 3、核心绘图更改
Resolved 'Cannot remove an observer for the key path "frame" from because it is not registered as an observer.'
Fix bug not remove the observer of frame in LYSecurityField.m .
Added integrated components that is LYPaymentAlertController
add a series of protocol ,such as "end editing","begin editing","delete a character","clear all characters".Easy to know the editor status.
Currently only the password input field, has not yet encapsulated into different styles of the alert.