Adds isEditable, isDeletable and isReorderable support for item views.  The previous docs indicated that if isEditable of the collection was true, it would set the property on the item views.  This was not the case, so there wasn't any way to have a list of items switch between a display mode to an editable mode.  This change uses canEditContent, canDeleteContent and canReorderContent to indicate whether to add the respective properties to the item views.  For example, this allows you to toggle canReorderContent to hide or show a drag handle on item views that have isReorderable as a display property.

Note: Setting isEditable to false on the collection view overrides the three other properties.
Adds unit tests for new isDeletable, isEditable & isReorderable item view support.
Fixes broken unit test.