public function destroy($id)
 {
     PostCategory::destroy($id);
     $child_cats = PostCategory::where('parent_id', '=', $id)->get();
     foreach ($child_cats as $cats) {
         $cats->parent_id = NULL;
         $cats->save();
     }
     return Redirect::to('admin/posts/categories')->with(array('note' => 'Successfully Deleted Category', 'note_type' => 'success'));
 }