Remove the default views now that admin_views is stable

The default views that ship with VBO have always been there as an example.
One of their problems is that they can't override the core paths, you need admin_views for that.
Their paths are also nonsensical, since they are not meant to show up in any menu.

Because of all that, we've had the discussion about removing them ever since I took over the D7 branch (#1009784: VBO default paths should change to resemble D7 logic).

Now that we have stable:
http://drupal.org/project/admin_views
http://drupal.org/project/commerce_backoffice
there is no need for VBO to provide default views anymore. Most people will just want admin_views.