OUITextView -scrollTextSelectionToVisibleWithAnimation: doesn't account for contentInset

[cutz]

OUITextView -scrollTextSelectionToVisibleWithAnimation: doesn't account for any contentInset when determining the contentOffset to scroll to. This causes issues, for example, if you use contentOffset adjustments to avoid the keyboard.

[cutz]

There isn't really much pull request activity in this repository. If you would be interested in accepting a pull request I would be happy to try and produce a fix.