Fix addButtonWithTitle so that newly created buttons will be enabled, according to the delegate.  Expose buttonAtIndex to allow renaming buttons.
Use a delayed fade in when showing the new button, so the button won't visibly appear outside of the bounds during layout change.
Bump pod spec to version 1.2.3
Fix tabs/spacing issues for pull request
Merge pull request #27 from markwpiper/markwpiper/editable-buttons

Markwpiper/editable buttons