Got rid of the "Bolognese code"

In Django-cms 3.0.0.beta2 your hack with minus one backfire and move all the icons to the next menu item :s
Please check the version number "2.4" as i didn't test this one.
Fall back on the default behavior if not version 2.4

Will still be compatible after the beta :)
Merge pull request #1 from altimore/patch-1

Got rid of the "Bolognese code"