增加PermissionGot注解 #12
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在使用MPermission的过程中发现在权限已获得和弹出授权对话框并同意这两种情形所面临的代码执行环境是不同的，系统弹出的授权对话框会使得原activity回调到OnSaveInstanceState，而已授权的话则不会有弹框出现。在弹出授权对话框后，若执行的注解方法中包含Fragment＃commit(DialogFragment＃show)则会因IllegalStateException而Crash掉；而在已获得授权时则执行相应方法不会有问题，这说明应提供一种方式来应对两种不同的执行环境。
在修改中参照原有代码增加了PermissionGot注解，当提供PermissionGot注解方法时，已获得授权将执行此方法，当未提供PermissionGot注解方法时，已获得授权将执行PermissionGrant注解方法，即用户可根据自己所面临的实际情况来选择是否需要将两者区别对待，若需要则添加上PermissionGot注解方法即可