Bulk delete action on user groups fails

[polakluk]

When you select a group to be deleted and use bulk delete, it fails, because it doesnt recognize $model->delete($id) in AdminList trait

[ChrisFrench]

This broken in several apps
On Jun 30, 2014 3:17 PM, "Lukas Polak" notifications@github.com wrote:

When you select a group to be deleted and use bulk delete, it fails,
because it doesnt recognize $model->delete($id) in AdminList trait

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#55.

[polakluk]

actually, it breaks it in all apps so I added to f3-lib repo since it's broken on lib level (f3-lib/issues/56)