Make the installer create the correct navigation items
Make the installer create the correct navigation items

We don't want separate backend navigation entries for add, edit, delete
actions. They all reside under index.
Other actions will get separate navigation entries

Fixes #29

jeroendesloovere/fork-cms-cli,turanct/forkmodule-cli,jeroendesloovere/fork-cms-cli,jonasdekeukelaere/forkmodule-cli,turanct/forkmodule-cli,jonasdekeukelaere/forkmodule-cli