fetchGapminder() needs better documentation

[rpruim]

From @rpruim on November 18, 2014 19:38

There are no examples and it is unclear that anyone could learn to use this from the documentation that is there.

Copied from original issue: ProjectMOSAIC/mosaic#405

[rpruim]

What is the difference between fetchGapminder() and fetchGapminder1()?

[rpruim]

I'm inclined to remove this unless someone (@dtkaplan?) makes a compelling case to keep it and fixes the documentation so that it is useable.

This would be a candidate for moving into a separate package containing various fetchers.

[rpruim]

> fetchGapminder()
Error: This function has been removed from the mosaic package.
> fetchGapminder1()
Error: This function has been removed from the mosaic package.

If we build a package with various "fetchers", our old code can be recycled there.