Not using UITextFieldDelegate to handle letter cut-off

Hi Natasha!

When you were creating a new quote, the last letter would get cut off. So rather than using the shouldChangeCharactersInRange delegate function, I would recommend firing a selector whenever the textField changes. 

This is very similar to what you were doing, but it fixes the bug, *and* you're not using shouldChangeCharactersInRange function, which is meant for finding out *if* a textField should change its value. To simply hijack the delegate function, do some additional work, and always return true, feels odd.

Let me know what you think!