fix spelling error?
Issue #4: add UzysAssetsPickerControllerDidExceedMaximumNumberOfSelection method into UzysAssetsPickerControllerDelegate, to give the chance to know whether the user has selected maximum of photos or videos.
Merge pull request #5 from jianpx/master

add UzysAssetsPickerControllerDidExceedMaximumNumberOfSelection method into UzysAssetsPickerControllerDelegate