Suggestion: respond to UITextViewTextDidChangeNotification, instead of delegate

[calioasis]

Great library! A suggestion:

If you respond to UITextViewTextDidChangeNotification inside GrowingTextViewHandler, you won't even need to deal with the textViewDelegate. Makes it even easier/faster to set up

[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(resizeTextViewWithAnimation:)
name:UITextViewTextDidChangeNotification
object:self.growingTextView];