Things that I would like to have for my development

Hi chrisbanes,

these are the changes that I would need for one of my projects.
The first commit makes it easier to use a custom ListView (in my case the SectionListView).
The second one is maybe useful if someone extends one of the PullToRefresh-classes and wants to override these methods. This is currently only possible if the class is in your package.

Greets,
hahnjo