Showing link to new pod guide after lib create (Issue #1644)

Hi guys.

This is my first time contributing to CocoaPods, so please feel free to correct me, if I'm doing something wrong, or missing anything.

This implements the Enhancement issue 1644. After running lib create, a second link is shown, linking to the new pod guide: http://guides.cocoapods.org/making/making-a-cocoapod

Regards.