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.