Allowed the globe keyword to PlateCarree.

I wanted to create an example to demonstrate choosing the wrong ellipse for your data - this involved upgrading the Globe's proj4 definition - as it turns out the arguments are order sensitive.

This work has helped me understand the proj4 datum/ellipse peculiarities and will allow follow on work to rationalise the interface in cartopy. That is not for here though (I just wanted to produce a pretty picture!).