Giving the user the option for refresh on action up

We can discuss the "bug fix" for using the screen width rather than height and change it back if it was for a different reason (which I have my suspicions it might be).

The pull request works with or without this.

With this option, when you pull down the list it will not be refreshed until the user lifts their finger off the scree.

Added examples to the sherlock & stock samples.