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                                            Steve

Fixed: self.placeholder does not update it's position when set textView's textContainerInset

the default vlue of textContainerInset is (8, 0, 8, 0) For example: ``` UIEdgeInsets edgeInsets = _textView.internalTextView.textContainerInset; edgeInsets.left = 8; edgeInsets.right = 8; _textView.internalTextView.textContainerInset = edgeInsets; ```

CHTFloorCGFloat may not work on 6S plus

Becase the scale on 6S plus is 3, when the value is 192.5, `CHTFloorCGFloat`return 192.33333333333334，I think you may keep one decimal by set scale to 10. ![image](https://cloud.githubusercontent.com/assets/1229786/15626201/fd1dea5c-24f0-11e6-9f53-7d6bbea815d9.png)

Migrated: swift 3.0 → 4.0

Ext: add `clearDrawLayer` function in `startScan` function for clearing operation