Fix: Running SchemaShell throws missing croogo_app_models table

Adding Croogo.Model directory in the search path causes Cake to
assume that CroogoAppModel is a real model with physical table.
Fix this by remove some Croogo plugin paths from the default
package search path.

These paths were originally added to support backward compatibility to
allow commands, existing layout/views to be referenced as before. So,
the Console/Command, View, and View/Helper paths are kept.