Gets rid of some ivars, replaced by readonly properties
Gets rid of some ivars, replaced by readonly properties

taojack/DZNPhotoPickerController,ndnguru/DZNPhotoPickerController,imjerrybao/DZNPhotoPickerController,dennislysenko/DZNPhotoPickerController,taojack/DZNPhotoPickerController,taojack/DZNPhotoPickerController,jonesgithub/DZNPhotoPickerController,jonesgithub/DZNPhotoPickerController,imjerrybao/DZNPhotoPickerController,dzenbot/DZNPhotoPickerController,dredenba/DZNPhotoPickerController,lichuanjun/DZNPhotoPickerController,jonesgithub/DZNPhotoPickerController,jonesgithub/DZNPhotoPickerController,taojack/DZNPhotoPickerController,topfreegames/TFGPhotoPickerController,ahbou/DZNPhotoPickerController,imjerrybao/DZNPhotoPickerController,imjerrybao/DZNPhotoPickerController