url function of Entity returns undefined for "showView" and "deleteView"

[ashwanikumar415]

Description

The Description mentioned over "Entity Configuration" page for url() (https://github.com/marmelab/ng-admin/blob/master/doc/reference/Entity.md) doesnt work
"entityName" argument returned is undefined for showView and deletionView.
Note: Correct value is returned only in editionView

Steps to Reproduce

plunkr : http://plnkr.co/edit/ivjRaAK8S0bMQYOv9XOi?p=preview

1. Clear logs in console window and run plunkr
2. Select users from leftMenu
3. click on "show", "edit" and "delete"
4. Observe logs : apart from editionView , show and deletionView returns undefined

Expected behavior:
entityName from deletionView: 1
entityName from showView: 1
entityName from editionView: 1

Actual behavior:
entityName from deletionView: undefined
entityName from showView: undefined
entityName from editionView: 1