[library] Fix NoSuchMethodError on AbsListView

AbsListView.setAdapter is only available for SDK_INT >= HONEYCOMB

    E/AndroidRuntime(20694): FATAL EXCEPTION: main
    E/AndroidRuntime(20694): java.lang.NoSuchMethodError: android.widget.AbsListView.setAdapter
    E/AndroidRuntime(20694):    at org.lucasr.smoothie.ItemManaged.setItemManager(ItemManaged.java:72)
    E/AndroidRuntime(20694):    at org.lucasr.smoothie.AsyncGridView.setItemManager(AsyncGridView.java:66)

On lower versions, cast it to GridView or ListView.